diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs
index 9182555af10fa3..d8c5a8925b46b2 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Emitter.cs
@@ -38,8 +38,12 @@ public void Emit(SourceProductionContext context)
 
                 _writer.WriteLine("""
                     // <auto-generated/>
-                    #nullable enable
-                    #pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+                    #nullable enable annotations
+                    #nullable disable warnings
+
+                    // Suppress warnings about [Obsolete] member usage in generated code.
+                    #pragma warning disable CS0612, CS0618
                     """);
 
                 EmitInterceptsLocationAttrDecl();
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Parser.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Parser.cs
index eda240b098cc6d..ead8e80a167373 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Parser.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/ConfigurationBindingGenerator.Parser.cs
@@ -509,7 +509,6 @@ private TypeSpec CreateEnumerableSpec(TypeParseInfo typeParseInfo)
             private ObjectSpec CreateObjectSpec(TypeParseInfo typeParseInfo)
             {
                 INamedTypeSymbol typeSymbol = (INamedTypeSymbol)typeParseInfo.TypeSymbol;
-                string typeName = typeSymbol.GetTypeName().Name;
 
                 ObjectInstantiationStrategy initializationStrategy = ObjectInstantiationStrategy.None;
                 DiagnosticDescriptor? initDiagDescriptor = null;
@@ -548,11 +547,11 @@ private ObjectSpec CreateObjectSpec(TypeParseInfo typeParseInfo)
                     if (!hasPublicParameterlessCtor && hasMultipleParameterizedCtors)
                     {
                         initDiagDescriptor = DiagnosticDescriptors.MultipleParameterizedConstructors;
-                        initExceptionMessage = string.Format(Emitter.ExceptionMessages.MultipleParameterizedConstructors, typeName);
+                        initExceptionMessage = string.Format(Emitter.ExceptionMessages.MultipleParameterizedConstructors, typeSymbol.GetFullName());
                     }
 
                     ctor = typeSymbol.IsValueType
-                        // Roslyn ctor fetching APIs include paramerterless ctors for structs, unlike System.Reflection.
+                        // Roslyn ctor fetching APIs include parameterless ctors for structs, unlike System.Reflection.
                         ? parameterizedCtor ?? parameterlessCtor
                         : parameterlessCtor ?? parameterizedCtor;
                 }
@@ -560,7 +559,7 @@ private ObjectSpec CreateObjectSpec(TypeParseInfo typeParseInfo)
                 if (ctor is null)
                 {
                     initDiagDescriptor = DiagnosticDescriptors.MissingPublicInstanceConstructor;
-                    initExceptionMessage = string.Format(Emitter.ExceptionMessages.MissingPublicInstanceConstructor, typeName);
+                    initExceptionMessage = string.Format(Emitter.ExceptionMessages.MissingPublicInstanceConstructor, typeSymbol.GetFullName());
                 }
                 else
                 {
@@ -634,7 +633,7 @@ private ObjectSpec CreateObjectSpec(TypeParseInfo typeParseInfo)
 
                     if (invalidParameters?.Count > 0)
                     {
-                        initExceptionMessage = string.Format(Emitter.ExceptionMessages.CannotBindToConstructorParameter, typeName, FormatParams(invalidParameters));
+                        initExceptionMessage = string.Format(Emitter.ExceptionMessages.CannotBindToConstructorParameter, typeSymbol.GetFullName(), FormatParams(invalidParameters));
                     }
                     else if (missingParameters?.Count > 0)
                     {
@@ -644,7 +643,7 @@ private ObjectSpec CreateObjectSpec(TypeParseInfo typeParseInfo)
                         }
                         else
                         {
-                            initExceptionMessage = string.Format(Emitter.ExceptionMessages.ConstructorParametersDoNotMatchProperties, typeName, FormatParams(missingParameters));
+                            initExceptionMessage = string.Format(Emitter.ExceptionMessages.ConstructorParametersDoNotMatchProperties, typeSymbol.GetFullName(), FormatParams(missingParameters));
                         }
                     }
 
@@ -819,7 +818,7 @@ private void RecordTypeDiagnosticIfRequired(TypeParseInfo typeParseInfo, TypeSpe
 
             private void RecordTypeDiagnostic(TypeParseInfo typeParseInfo, DiagnosticDescriptor descriptor)
             {
-                RecordDiagnostic(descriptor, typeParseInfo.BinderInvocation.Location, new object?[] { typeParseInfo.TypeName });
+                RecordDiagnostic(descriptor, typeParseInfo.BinderInvocation.Location, [typeParseInfo.FullName]);
                 ReportContainingTypeDiagnosticIfRequired(typeParseInfo);
             }
 
@@ -829,7 +828,7 @@ private void ReportContainingTypeDiagnosticIfRequired(TypeParseInfo typeParseInf
 
                 while (containingTypeDiagInfo is not null)
                 {
-                    string containingTypeName = containingTypeDiagInfo.TypeName;
+                    string containingTypeName = containingTypeDiagInfo.FullName;
 
                     object[] messageArgs = containingTypeDiagInfo.MemberName is string memberName
                         ? new[] { memberName, containingTypeName }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/ConfigurationBinder.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/ConfigurationBinder.cs
index 4dbe36accbc6e1..c6f23779ec93d4 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/ConfigurationBinder.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/ConfigurationBinder.cs
@@ -147,7 +147,7 @@ void EmitMethods(ImmutableEquatableArray<TypedInterceptorInvocationInfo>? interc
                             EmitCheckForNullArgument_WithBlankLine(Identifier.configuration, _emitThrowIfNullMethod);
                             EmitCheckForNullArgument_WithBlankLine(Identifier.instance, _emitThrowIfNullMethod, voidReturn: true);
                             _writer.WriteLine($$"""
-                                var {{Identifier.typedObj}} = ({{type.DisplayString}}){{Identifier.instance}};
+                                var {{Identifier.typedObj}} = ({{type.TypeRef.FullyQualifiedName}}){{Identifier.instance}};
                                 {{nameof(MethodsToGen_CoreBindingHelper.BindCore)}}({{configExpression}}, ref {{Identifier.typedObj}}, defaultValueIfNotFound: false, {{binderOptionsArg}});
                                 """);
                         }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/CoreBindingHelpers.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/CoreBindingHelpers.cs
index 03366f8b49810b..2cba4ca61b50e6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/CoreBindingHelpers.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/CoreBindingHelpers.cs
@@ -107,7 +107,7 @@ private void EmitGetCoreMethod()
                     TypeSpec effectiveType = _typeIndex.GetEffectiveTypeSpec(type);
                     string conditionKindExpr = GetConditionKindExpr(ref isFirstType);
 
-                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.DisplayString}))");
+                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.TypeRef.FullyQualifiedName}))");
 
                     switch (effectiveType)
                     {
@@ -144,7 +144,7 @@ private void EmitGetCoreMethod()
 #if DEBUG
                                 else
                                 {
-                                    Debug.Fail($"Complex should not be included for GetCore gen: {complexType.DisplayString}");
+                                    Debug.Fail($"Complex should not be included for GetCore gen: {complexType.TypeRef.FullyQualifiedName}");
                                 }
 #endif
                             }
@@ -195,7 +195,7 @@ private void EmitGetValueCoreMethod()
                 foreach (TypeSpec type in targetTypes)
                 {
                     string conditionKindExpr = GetConditionKindExpr(ref isFirstType);
-                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.DisplayString}))");
+                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.TypeRef.FullyQualifiedName}))");
 
                     EmitBindingLogic(
                         (ParsableFromStringSpec)_typeIndex.GetEffectiveTypeSpec(type),
@@ -236,8 +236,8 @@ private void EmitBindCoreMainMethod()
                     Debug.Assert(_typeIndex.HasBindableMembers(effectiveType));
                     string conditionKindExpr = GetConditionKindExpr(ref isFirstType);
 
-                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.DisplayString}))");
-                    _writer.WriteLine($"var {Identifier.temp} = ({effectiveType.DisplayString}){Identifier.instance};");
+                    EmitStartBlock($"{conditionKindExpr} ({Identifier.type} == typeof({type.TypeRef.FullyQualifiedName}))");
+                    _writer.WriteLine($"var {Identifier.temp} = ({effectiveType.TypeRef.FullyQualifiedName}){Identifier.instance};");
                     EmitBindingLogic(type, Identifier.temp, Identifier.configuration, InitializationKind.None, ValueDefaulting.None);
                     _writer.WriteLine($"return;");
                     EmitEndBlock();
@@ -265,7 +265,7 @@ private void EmitBindCoreMethods()
 
             private void EmitBindCoreMethod(ComplexTypeSpec type)
             {
-                string objParameterExpression = $"ref {type.DisplayString} {Identifier.instance}";
+                string objParameterExpression = $"ref {type.TypeRef.FullyQualifiedName} {Identifier.instance}";
                 EmitStartBlock(@$"public static void {nameof(MethodsToGen_CoreBindingHelper.BindCore)}({Identifier.IConfiguration} {Identifier.configuration}, {objParameterExpression}, bool defaultValueIfNotFound, {Identifier.BinderOptions}? {Identifier.binderOptions})");
 
                 ComplexTypeSpec effectiveType = (ComplexTypeSpec)_typeIndex.GetEffectiveTypeSpec(type);
@@ -326,9 +326,8 @@ private void EmitInitializeMethod(ObjectSpec type)
 
                 IEnumerable<PropertySpec> initOnlyProps = type.Properties.Where(prop => prop is { SetOnInit: true });
                 List<string> ctorArgList = new();
-                string displayString = type.DisplayString;
 
-                EmitStartBlock($"public static {type.DisplayString} {GetInitalizeMethodDisplayString(type)}({Identifier.IConfiguration} {Identifier.configuration}, {Identifier.BinderOptions}? {Identifier.binderOptions})");
+                EmitStartBlock($"public static {type.TypeRef.FullyQualifiedName} {GetInitalizeMethodDisplayString(type)}({Identifier.IConfiguration} {Identifier.configuration}, {Identifier.BinderOptions}? {Identifier.binderOptions})");
                 _emitBlankLineBeforeNextStatement = false;
 
                 foreach (ParameterSpec parameter in type.ConstructorParameters)
@@ -355,7 +354,7 @@ private void EmitInitializeMethod(ObjectSpec type)
                     }
                 }
 
-                string returnExpression = $"return new {displayString}({string.Join(", ", ctorArgList)})";
+                string returnExpression = $"return new {type.TypeRef.FullyQualifiedName}({string.Join(", ", ctorArgList)})";
                 if (!initOnlyProps.Any())
                 {
                     _writer.WriteLine($"{returnExpression};");
@@ -378,7 +377,7 @@ private void EmitInitializeMethod(ObjectSpec type)
                 void EmitBindImplForMember(MemberSpec member)
                 {
                     TypeSpec memberType = _typeIndex.GetTypeSpec(member.TypeRef);
-                    string parsedMemberDeclarationLhs = $"{memberType.DisplayString} {member.Name}";
+                    string parsedMemberDeclarationLhs = $"{memberType.TypeRef.FullyQualifiedName} {member.Name}";
                     string configKeyName = member.ConfigurationKeyName;
                     string parsedMemberAssignmentLhsExpr;
 
@@ -437,7 +436,7 @@ void EmitThrowBlock(string condition) =>
                         _writer.WriteLine($$"""
                             {{condition}}
                             {
-                                throw new {{Identifier.InvalidOperationException}}("{{string.Format(ExceptionMessages.ParameterHasNoMatchingConfig, type.Name, member.Name)}}");
+                                throw new {{Identifier.InvalidOperationException}}("{{string.Format(ExceptionMessages.ParameterHasNoMatchingConfig, type.FullName, member.Name)}}");
                             }
                             """);
                 }
@@ -600,7 +599,7 @@ public static T ParseEnum<T>(string value, Func<string?> getPath) where T : stru
             private void EmitPrimitiveParseMethod(ParsableFromStringSpec type)
             {
                 StringParsableTypeKind typeKind = type.StringParsableTypeKind;
-                string typeDisplayString = type.DisplayString;
+                string typeFQN = type.TypeRef.FullyQualifiedName;
 
                 string invariantCultureExpression = $"{Identifier.CultureInfo}.InvariantCulture";
                 string parsedValueExpr;
@@ -614,22 +613,22 @@ private void EmitPrimitiveParseMethod(ParsableFromStringSpec type)
                         break;
                     case StringParsableTypeKind.Integer:
                         {
-                            parsedValueExpr = $"{typeDisplayString}.{Identifier.Parse}({Identifier.value}, {Identifier.NumberStyles}.Integer, {invariantCultureExpression})";
+                            parsedValueExpr = $"{typeFQN}.{Identifier.Parse}({Identifier.value}, {Identifier.NumberStyles}.Integer, {invariantCultureExpression})";
                         }
                         break;
                     case StringParsableTypeKind.Float:
                         {
-                            parsedValueExpr = $"{typeDisplayString}.{Identifier.Parse}({Identifier.value}, {Identifier.NumberStyles}.Float, {invariantCultureExpression})";
+                            parsedValueExpr = $"{typeFQN}.{Identifier.Parse}({Identifier.value}, {Identifier.NumberStyles}.Float, {invariantCultureExpression})";
                         }
                         break;
                     case StringParsableTypeKind.Parse:
                         {
-                            parsedValueExpr = $"{typeDisplayString}.{Identifier.Parse}({Identifier.value})";
+                            parsedValueExpr = $"{typeFQN}.{Identifier.Parse}({Identifier.value})";
                         }
                         break;
                     case StringParsableTypeKind.ParseInvariant:
                         {
-                            parsedValueExpr = $"{typeDisplayString}.{Identifier.Parse}({Identifier.value}, {invariantCultureExpression})"; ;
+                            parsedValueExpr = $"{typeFQN}.{Identifier.Parse}({Identifier.value}, {invariantCultureExpression})"; ;
                         }
                         break;
                     case StringParsableTypeKind.CultureInfo:
@@ -649,9 +648,9 @@ private void EmitPrimitiveParseMethod(ParsableFromStringSpec type)
                         }
                 }
 
-                string exceptionArg1 = string.Format(ExceptionMessages.FailedBinding, $"{{{Identifier.getPath}()}}", $"{{typeof({typeDisplayString})}}");
+                string exceptionArg1 = string.Format(ExceptionMessages.FailedBinding, $"{{{Identifier.getPath}()}}", $"{{typeof({typeFQN})}}");
 
-                EmitStartBlock($"public static {typeDisplayString} {TypeIndex.GetParseMethodName(type)}(string {Identifier.value}, Func<string?> {Identifier.getPath})");
+                EmitStartBlock($"public static {typeFQN} {TypeIndex.GetParseMethodName(type)}(string {Identifier.value}, Func<string?> {Identifier.getPath})");
                 EmitEndBlock($$"""
                     try
                     {
@@ -667,11 +666,11 @@ private void EmitPrimitiveParseMethod(ParsableFromStringSpec type)
             private void EmitBindCoreImplForArray(ArraySpec type)
             {
                 TypeRef elementTypeRef = type.ElementTypeRef;
-                string elementTypeDisplayString = _typeIndex.GetTypeSpec(elementTypeRef).DisplayString;
+                string elementTypeFQN = type.ElementTypeRef.FullyQualifiedName;
                 string tempIdentifier = GetIncrementalIdentifier(Identifier.temp);
 
                 // Create temp list.
-                _writer.WriteLine($"var {tempIdentifier} = new List<{elementTypeDisplayString}>();");
+                _writer.WriteLine($"var {tempIdentifier} = new List<{elementTypeFQN}>();");
                 _writer.WriteLine();
 
                 // Bind elements to temp list.
@@ -773,13 +772,13 @@ void Emit_BindAndAddLogic_ForElement(string parsedKeyExpr)
                                 if (keyType.StringParsableTypeKind is not StringParsableTypeKind.AssignFromSectionValue)
                                 {
                                     // Save value to local to avoid parsing twice - during look-up and during add.
-                                    _writer.WriteLine($"{keyType.DisplayString} {Identifier.key} = {parsedKeyExpr};");
+                                    _writer.WriteLine($"{keyType.TypeRef.FullyQualifiedName} {Identifier.key} = {parsedKeyExpr};");
                                     parsedKeyExpr = Identifier.key;
                                 }
 
                                 bool isValueType = complexElementType.IsValueType;
                                 string expressionForElementIsNotNull = $"{Identifier.element} is not null";
-                                string elementTypeDisplayString = complexElementType.DisplayString + (complexElementType.IsValueType ? string.Empty : "?");
+                                string elementTypeDisplayString = complexElementType.TypeRef.FullyQualifiedName + (complexElementType.IsValueType ? string.Empty : "?");
 
                                 string expressionForElementExists = $"{instanceIdentifier}.{Identifier.TryGetValue}({parsedKeyExpr}, out {elementTypeDisplayString} {Identifier.element})";
                                 string conditionToUseExistingElement = expressionForElementExists;
@@ -829,14 +828,14 @@ private void EmitBindCoreImplForObject(ObjectSpec type)
                 Debug.Assert(_typeIndex.HasBindableMembers(type));
 
                 string keyCacheFieldName = TypeIndex.GetConfigKeyCacheFieldName(type);
-                string validateMethodCallExpr = $"{Identifier.ValidateConfigurationKeys}(typeof({type.DisplayString}), {keyCacheFieldName}, {Identifier.configuration}, {Identifier.binderOptions});";
+                string validateMethodCallExpr = $"{Identifier.ValidateConfigurationKeys}(typeof({type.TypeRef.FullyQualifiedName}), {keyCacheFieldName}, {Identifier.configuration}, {Identifier.binderOptions});";
                 _writer.WriteLine(validateMethodCallExpr);
 
                 foreach (PropertySpec property in type.Properties!)
                 {
                     if (_typeIndex.ShouldBindTo(property))
                     {
-                        string containingTypeRef = property.IsStatic ? type.DisplayString : Identifier.instance;
+                        string containingTypeRef = property.IsStatic ? type.TypeRef.FullyQualifiedName : Identifier.instance;
                         EmitBindImplForMember(
                             property,
                             memberAccessExpr: $"{containingTypeRef}.{property.Name}",
@@ -930,21 +929,21 @@ private void EmitBindingLogicForComplexMember(
                     }
 
                     Debug.Assert(canSet);
-                    string effectiveMemberTypeDisplayString = effectiveMemberType.DisplayString;
+                    string effectiveMemberTypeFQN = effectiveMemberType.TypeRef.FullyQualifiedName;
                     initKind = InitializationKind.None;
 
                     if (memberType is NullableSpec)
                     {
                         string nullableTempIdentifier = GetIncrementalIdentifier(Identifier.temp);
 
-                        _writer.WriteLine($"{memberType.DisplayString} {nullableTempIdentifier} = {memberAccessExpr};");
+                        _writer.WriteLine($"{memberType.TypeRef.FullyQualifiedName} {nullableTempIdentifier} = {memberAccessExpr};");
 
                         _writer.WriteLine(
-                            $"{effectiveMemberTypeDisplayString} {tempIdentifier} = {nullableTempIdentifier}.{Identifier.HasValue} ? {nullableTempIdentifier}.{Identifier.Value} : new {effectiveMemberTypeDisplayString}();");
+                            $"{effectiveMemberTypeFQN} {tempIdentifier} = {nullableTempIdentifier}.{Identifier.HasValue} ? {nullableTempIdentifier}.{Identifier.Value} : new {effectiveMemberTypeFQN}();");
                     }
                     else
                     {
-                        _writer.WriteLine($"{effectiveMemberTypeDisplayString} {tempIdentifier} = {memberAccessExpr};");
+                        _writer.WriteLine($"{effectiveMemberTypeFQN} {tempIdentifier} = {memberAccessExpr};");
                     }
 
                     targetObjAccessExpr = tempIdentifier;
@@ -1009,7 +1008,7 @@ private void EmitBindingLogic(
                 if (initKind is InitializationKind.AssignmentWithNullCheck)
                 {
                     Debug.Assert(!type.IsValueType);
-                    _writer.WriteLine($"{type.DisplayString}? {tempIdentifier} = {memberAccessExpr};");
+                    _writer.WriteLine($"{type.TypeRef.FullyQualifiedName}? {tempIdentifier} = {memberAccessExpr};");
                     EmitBindingLogic(tempIdentifier, InitializationKind.AssignmentWithNullCheck);
                 }
                 else if (initKind is InitializationKind.None && type.IsValueType)
@@ -1076,7 +1075,7 @@ private void EmitBindingLogic(
                 string parsedValueExpr = typeKind switch
                 {
                     StringParsableTypeKind.AssignFromSectionValue => stringValueToParse_Expr,
-                    StringParsableTypeKind.Enum => $"ParseEnum<{type.DisplayString}>({stringValueToParse_Expr}, () => {sectionPathExpr})",
+                    StringParsableTypeKind.Enum => $"ParseEnum<{type.TypeRef.FullyQualifiedName}>({stringValueToParse_Expr}, () => {sectionPathExpr})",
                     _ => $"{TypeIndex.GetParseMethodName(type)}({stringValueToParse_Expr}, () => {sectionPathExpr})",
                 };
 
@@ -1110,12 +1109,12 @@ private bool EmitObjectInit(ComplexTypeSpec type, string memberAccessExpr, Initi
                 string? castExpr = null;
                 string initExpr;
 
-                string effectiveDisplayString = type.DisplayString;
+                string typeFQN = type.TypeRef.FullyQualifiedName;
                 if (collectionType is not null)
                 {
                     if (collectionType is ArraySpec)
                     {
-                        initExpr = $"new {s_arrayBracketsRegex.Replace(effectiveDisplayString, "[0]", 1)}";
+                        initExpr = $"new {s_arrayBracketsRegex.Replace(typeFQN, "[0]", 1)}";
                     }
                     else
                     {
@@ -1123,11 +1122,11 @@ private bool EmitObjectInit(ComplexTypeSpec type, string memberAccessExpr, Initi
 
                         if (collectionWithCtorInitType.InstantiationConcreteType is not CollectionInstantiationConcreteType.Self)
                         {
-                            castExpr = $"({collectionWithCtorInitType.DisplayString})";
+                            castExpr = $"({collectionWithCtorInitType.TypeRef.FullyQualifiedName})";
                         }
 
-                        effectiveDisplayString = _typeIndex.GetInstantiationTypeDisplayString(collectionWithCtorInitType);
-                        initExpr = $"{castExpr}new {effectiveDisplayString}()";
+                        typeFQN = TypeIndex.GetInstantiationTypeDisplayString(collectionWithCtorInitType);
+                        initExpr = $"{castExpr}new {typeFQN}()";
                     }
                 }
                 else
@@ -1137,7 +1136,7 @@ private bool EmitObjectInit(ComplexTypeSpec type, string memberAccessExpr, Initi
 
                     if (strategy is ObjectInstantiationStrategy.ParameterlessConstructor)
                     {
-                        initExpr = $"new {effectiveDisplayString}()";
+                        initExpr = $"new {typeFQN}()";
                     }
                     else
                     {
@@ -1164,7 +1163,7 @@ private bool EmitObjectInit(ComplexTypeSpec type, string memberAccessExpr, Initi
                                 } collectionWithCtorInitType)
                             {
                                 string assignmentValueIfMemberNull = collectionWithCtorInitType.InstantiationStrategy is CollectionInstantiationStrategy.CopyConstructor
-                                    ? $"new {effectiveDisplayString}({memberAccessExpr})"
+                                    ? $"new {typeFQN}({memberAccessExpr})"
                                     : $"{memberAccessExpr}.ToDictionary(pair => pair.Key, pair => pair.Value)";
 
                                 Debug.Assert(castExpr is not null || collectionWithCtorInitType.InstantiationConcreteType is CollectionInstantiationConcreteType.Self);
@@ -1213,7 +1212,7 @@ private void EmitCollectionCastIfRequired(CollectionWithCtorInitSpec type, out s
                     return;
                 }
 
-                string castTypeDisplayString = _typeIndex.GetPopulationCastTypeDisplayString(type);
+                string castTypeDisplayString = TypeIndex.GetPopulationCastTypeDisplayString(type);
                 instanceIdentifier = Identifier.temp;
 
                 _writer.WriteLine($$"""
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Parser/Extensions.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Parser/Extensions.cs
index f685842639966a..aeb78253825e56 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Parser/Extensions.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Parser/Extensions.cs
@@ -15,7 +15,11 @@ internal sealed partial class Parser
             private readonly struct TypeParseInfo
             {
                 public ITypeSymbol TypeSymbol { get; private init; }
-                public string TypeName { get; private init; }
+
+                /// <summary>
+                /// <see cref="System.Type.FullName"/> like rendering of the symbol name.
+                /// </summary>
+                public string FullName { get; private init; }
                 public MethodsToGen BindingOverload { get; private init; }
                 public BinderInvocation BinderInvocation { get; private init; }
                 public ContainingTypeDiagnosticInfo? ContainingTypeDiagnosticInfo { get; private init; }
@@ -24,7 +28,7 @@ public static TypeParseInfo Create(ITypeSymbol typeSymbol, MethodsToGen overload
                     new TypeParseInfo
                     {
                         TypeSymbol = typeSymbol,
-                        TypeName = typeSymbol.GetName(),
+                        FullName = typeSymbol.GetFullName(),
                         BindingOverload = overload,
                         BinderInvocation = invocation,
                         ContainingTypeDiagnosticInfo = containingTypeDiagInfo,
@@ -36,7 +40,7 @@ public TypeParseInfo ToTransitiveTypeParseInfo(ITypeSymbol memberType, Diagnosti
                         ? null
                         : new()
                         {
-                            TypeName = TypeName,
+                            FullName = FullName,
                             Descriptor = diagDescriptor,
                             MemberName = memberName,
                             ContainingTypeInfo = ContainingTypeDiagnosticInfo,
@@ -48,7 +52,10 @@ public TypeParseInfo ToTransitiveTypeParseInfo(ITypeSymbol memberType, Diagnosti
 
             private sealed class ContainingTypeDiagnosticInfo
             {
-                public required string TypeName { get; init; }
+                /// <summary>
+                /// <see cref="System.Type.FullName"/> like rendering of the symbol name.
+                /// </summary>
+                public required string FullName { get; init; }
                 public required string? MemberName { get; init; }
                 public required DiagnosticDescriptor Descriptor { get; init; }
                 public required ContainingTypeDiagnosticInfo? ContainingTypeInfo { get; init; }
@@ -113,14 +120,14 @@ public static string ToIdentifierCompatibleSubstring(this ITypeSymbol type)
             return sb.ToString();
         }
 
-        public static (string? Namespace, string DisplayString, string Name) GetTypeName(this ITypeSymbol type)
+        public static (string DisplayString, string FullName) GetTypeNames(this ITypeSymbol type)
         {
             string? @namespace = type.ContainingNamespace is { IsGlobalNamespace: false } containingNamespace ? containingNamespace.ToDisplayString() : null;
             string displayString = type.ToDisplayString(s_minimalDisplayFormat);
-            string name = (@namespace is null ? string.Empty : @namespace + ".") + displayString.Replace(".", "+");
-            return (@namespace, displayString, name);
+            string fullname = (@namespace is null ? string.Empty : @namespace + ".") + displayString.Replace(".", "+");
+            return (displayString, fullname);
         }
 
-        public static string GetName(this ITypeSymbol type) => GetTypeName(type).Name;
+        public static string GetFullName(this ITypeSymbol type) => GetTypeNames(type).FullName;
     }
 }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/BindingHelperInfo.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/BindingHelperInfo.cs
index 096c8410717ae7..316b904de88979 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/BindingHelperInfo.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/BindingHelperInfo.cs
@@ -214,11 +214,6 @@ private void RegisterTypeForMethodGen(MethodsToGen_CoreBindingHelper method, Typ
                 if (types.Add(type))
                 {
                     _methodsToGen |= method;
-
-                    if (type is { Namespace: string @namespace })
-                    {
-                        _namespaces.Add(@namespace);
-                    }
                 }
             }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
index 5b59577b392921..5328d1da922a3a 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
@@ -68,33 +68,33 @@ public TypeSpec GetEffectiveTypeSpec(TypeSpec typeSpec)
 
         public TypeSpec GetTypeSpec(TypeRef typeRef) => _index[typeRef];
 
-        public string GetInstantiationTypeDisplayString(CollectionWithCtorInitSpec type)
+        public static string GetInstantiationTypeDisplayString(CollectionWithCtorInitSpec type)
         {
             CollectionInstantiationConcreteType concreteType = type.InstantiationConcreteType;
             return concreteType is CollectionInstantiationConcreteType.Self
-                ? type.DisplayString
+                ? type.TypeRef.FullyQualifiedName
                 : GetGenericTypeDisplayString(type, concreteType);
         }
 
-        public string GetPopulationCastTypeDisplayString(CollectionWithCtorInitSpec type)
+        public static string GetPopulationCastTypeDisplayString(CollectionWithCtorInitSpec type)
         {
             CollectionPopulationCastType castType = type.PopulationCastType;
             Debug.Assert(castType is not CollectionPopulationCastType.NotApplicable);
             return GetGenericTypeDisplayString(type, castType);
         }
 
-        public string GetGenericTypeDisplayString(CollectionWithCtorInitSpec type, Enum genericProxyTypeName)
+        public static string GetGenericTypeDisplayString(CollectionWithCtorInitSpec type, Enum genericProxyTypeName)
         {
             string proxyTypeNameStr = genericProxyTypeName.ToString();
-            string elementTypeDisplayString = GetTypeSpec(type.ElementTypeRef).DisplayString;
+            string elementTypeFQN = type.ElementTypeRef.FullyQualifiedName;
 
             if (type is EnumerableSpec)
             {
-                return $"{proxyTypeNameStr}<{elementTypeDisplayString}>";
+                return $"{proxyTypeNameStr}<{elementTypeFQN}>";
             }
 
-            string keyTypeDisplayString = GetTypeSpec(((DictionarySpec)type).KeyTypeRef).DisplayString;
-            return $"{proxyTypeNameStr}<{keyTypeDisplayString}, {elementTypeDisplayString}>";
+            string keyTypeDisplayString = ((DictionarySpec)type).KeyTypeRef.FullyQualifiedName;
+            return $"{proxyTypeNameStr}<{keyTypeDisplayString}, {elementTypeFQN}>";
         }
 
         public bool KeyIsSupported(DictionarySpec typeSpec) =>
@@ -109,14 +109,31 @@ public static string GetParseMethodName(ParsableFromStringSpec type)
         {
             Debug.Assert(type.StringParsableTypeKind is not StringParsableTypeKind.AssignFromSectionValue);
 
-            string displayString = type.DisplayString;
+            if (type.StringParsableTypeKind is StringParsableTypeKind.ByteArray)
+            {
+                return "ParseByteArray";
+            }
+
+            string displayString = type.TypeRef.FullyQualifiedName;
+
+            const string GlobalPrefix = "global::";
+            if (displayString.StartsWith(GlobalPrefix))
+            {
+                displayString = displayString.Substring(GlobalPrefix.Length);
+            }
 
-            string parseMethod = type.StringParsableTypeKind is StringParsableTypeKind.ByteArray
-                ? "ParseByteArray"
-                // MinimalDisplayString.Length is certainly > 2.
-                : $"Parse{(char.ToUpper(displayString[0]) + displayString.Substring(1)).Replace(".", "")}";
+            Debug.Assert(displayString.Length > 0);
+            if (char.IsLower(displayString[0]))
+            {
+                displayString = char.ToUpperInvariant(displayString[0]) + displayString.Substring(1);
+            }
+
+            if (displayString.Contains('.'))
+            {
+                displayString = displayString.Replace(".", "");
+            }
 
-            return parseMethod;
+            return "Parse" + displayString;
         }
     }
 }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/Types/TypeSpec.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/Types/TypeSpec.cs
index 1c243ae1cdc7c1..69168edb58eff8 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/Types/TypeSpec.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/Types/TypeSpec.cs
@@ -13,8 +13,8 @@ public abstract record TypeSpec
         public TypeSpec(ITypeSymbol type)
         {
             TypeRef = new TypeRef(type);
-            EffectiveTypeRef = TypeRef; // Overriden by NullableSpec.
-            (Namespace, DisplayString, Name) = type.GetTypeName();
+            EffectiveTypeRef = TypeRef; // Overridden by NullableSpec.
+            (DisplayString, FullName) = type.GetTypeNames();
             IdentifierCompatibleSubstring = type.ToIdentifierCompatibleSubstring();
             IsValueType = type.IsValueType;
         }
@@ -23,14 +23,18 @@ public TypeSpec(ITypeSymbol type)
 
         public TypeRef EffectiveTypeRef { get; protected init; }
 
-        public string Name { get; }
+        /// <summary>
+        /// <see cref="System.Type.FullName"/> like rendering of the type name.
+        /// </summary>
+        public string FullName { get; }
 
+        /// <summary>
+        /// Display name excluding the namespace.
+        /// </summary>
         public string DisplayString { get; }
 
         public string IdentifierCompatibleSubstring { get; }
 
-        public string? Namespace { get; }
-
         public bool IsValueType { get; }
     }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Collections.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Collections.generated.txt
index ea4fba79cbc465..a03d4c855c399c 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Collections.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Collections.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -53,9 +57,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClassWithCustomCollections))
+            if (type == typeof(global::Program.MyClassWithCustomCollections))
             {
-                var instance = new Program.MyClassWithCustomCollections();
+                var instance = new global::Program.MyClassWithCustomCollections();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -63,7 +67,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.CustomDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.CustomDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -74,7 +78,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.CustomList instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.CustomList instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -85,7 +89,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             if (instance is not ICollection<int> temp)
             {
@@ -101,7 +105,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             if (instance is not IDictionary<string, int> temp)
             {
@@ -117,38 +121,38 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClassWithCustomCollections instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClassWithCustomCollections instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClassWithCustomCollections), s_configKeys_ProgramMyClassWithCustomCollections, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClassWithCustomCollections), s_configKeys_ProgramMyClassWithCustomCollections, configuration, binderOptions);
 
             if (AsConfigWithChildren(configuration.GetSection("CustomDictionary")) is IConfigurationSection section1)
             {
-                Program.CustomDictionary<string, int>? temp3 = instance.CustomDictionary;
-                temp3 ??= new Program.CustomDictionary<string, int>();
+                global::Program.CustomDictionary<string, int>? temp3 = instance.CustomDictionary;
+                temp3 ??= new global::Program.CustomDictionary<string, int>();
                 BindCore(section1, ref temp3, defaultValueIfNotFound: false, binderOptions);
                 instance.CustomDictionary = temp3;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("CustomList")) is IConfigurationSection section4)
             {
-                Program.CustomList? temp6 = instance.CustomList;
-                temp6 ??= new Program.CustomList();
+                global::Program.CustomList? temp6 = instance.CustomList;
+                temp6 ??= new global::Program.CustomList();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.CustomList = temp6;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("IReadOnlyList")) is IConfigurationSection section7)
             {
-                IReadOnlyList<int>? temp9 = instance.IReadOnlyList;
-                temp9 = temp9 is null ? (IReadOnlyList<int>)new List<int>() : (IReadOnlyList<int>)new List<int>(temp9);
+                global::System.Collections.Generic.IReadOnlyList<int>? temp9 = instance.IReadOnlyList;
+                temp9 = temp9 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>(temp9);
                 BindCore(section7, ref temp9, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyList = temp9;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("IReadOnlyDictionary")) is IConfigurationSection section10)
             {
-                IReadOnlyDictionary<string, int>? temp12 = instance.IReadOnlyDictionary;
-                temp12 = temp12 is null ? (IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (IReadOnlyDictionary<string, int>)temp12.ToDictionary(pair => pair.Key, pair => pair.Value);
+                global::System.Collections.Generic.IReadOnlyDictionary<string, int>? temp12 = instance.IReadOnlyDictionary;
+                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp12.ToDictionary(pair => pair.Key, pair => pair.Value);
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind.generated.txt
index fc0dda4b5b3ae9..8cb6fa53a52eb5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -44,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
 
@@ -62,7 +66,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, GetBinderOptions(configureOptions));
         }
 
@@ -80,7 +84,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration.GetSection(key), ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -88,7 +92,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -99,7 +103,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -110,21 +114,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -142,24 +146,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance.generated.txt
index 9cbc0a22c5c84d..392f067b9c3645 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -44,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -52,7 +56,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -63,7 +67,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -74,21 +78,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -106,24 +110,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
index f3efa07fc0c5c2..35f4495fe0c185 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -44,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, GetBinderOptions(configureOptions));
         }
         #endregion IConfiguration extensions.
@@ -52,7 +56,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -63,7 +67,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -74,21 +78,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -106,24 +110,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Key_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Key_Instance.generated.txt
index 89b82d31bc19ae..6373c432f52401 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Key_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_Key_Instance.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -44,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration.GetSection(key), ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -52,7 +56,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -63,7 +67,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -74,21 +78,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -106,24 +110,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
index 14753a4a1f8e4b..2a1453546c7bf9 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get.generated.txt
index b6fb659d544d42..b51fefddba98ad 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -65,15 +69,15 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
-            else if (type == typeof(Program.MyClass2))
+            else if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -81,7 +85,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -109,7 +113,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp2.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -120,9 +124,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -140,8 +144,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
@@ -156,16 +160,16 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value14)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue.generated.txt
index bf7e64bd31f90c..e6fb4b5166ed89 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -73,9 +77,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             {
                 return ParseByteArray(value, () => section.Path);
             }
-            else if (type == typeof(CultureInfo))
+            else if (type == typeof(global::System.Globalization.CultureInfo))
             {
-                return ParseCultureInfo(value, () => section.Path);
+                return ParseSystemGlobalizationCultureInfo(value, () => section.Path);
             }
 
             return null;
@@ -117,7 +121,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -125,7 +129,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
         #endregion Core binding extensions.
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key.generated.txt
index b86915b78303b2..273df87c8e8098 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
index 697f710dff3027..b3d91eb6b49e8a 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
index b5a22e71ccefbf..b8c1c5b1381915 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
index 4a4564796e562f..f93fb114275fe8 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -49,15 +53,15 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(CultureInfo))
+            if (type == typeof(global::System.Globalization.CultureInfo))
             {
-                return ParseCultureInfo(value, () => section.Path);
+                return ParseSystemGlobalizationCultureInfo(value, () => section.Path);
             }
 
             return null;
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -65,7 +69,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
         #endregion Core binding extensions.
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_PrimitivesOnly.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
index b703fb5f1c864b..446bf43866a38e 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T.generated.txt
index c2e8f167bb4750..8eecd3ba72a1e1 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -52,9 +56,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -62,7 +66,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -90,7 +94,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp1.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -101,9 +105,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value2)
             {
@@ -121,8 +125,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section4)
             {
-                List<int>? temp6 = instance.MyList;
-                temp6 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp6 = instance.MyList;
+                temp6 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp6;
             }
@@ -137,8 +141,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section10)
             {
-                Dictionary<string, string>? temp12 = instance.MyDictionary;
-                temp12 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp12 = instance.MyDictionary;
+                temp12 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T_BinderOptions.generated.txt
index cd3f237917d4e3..ec88c39f20a2de 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -52,9 +56,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -62,7 +66,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -90,7 +94,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp1.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -101,9 +105,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value2)
             {
@@ -121,8 +125,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section4)
             {
-                List<int>? temp6 = instance.MyList;
-                temp6 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp6 = instance.MyList;
+                temp6 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp6;
             }
@@ -137,8 +141,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section10)
             {
-                Dictionary<string, string>? temp12 = instance.MyDictionary;
-                temp12 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp12 = instance.MyDictionary;
+                temp12 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf.generated.txt
index eca2001123ff01..46c24547478ab1 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -52,9 +56,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass2))
+            if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -62,9 +66,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
index 7883f4a50da0f6..f37307065a78e3 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -52,9 +56,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass2))
+            if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -62,9 +66,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/EmptyConfigType.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/EmptyConfigType.generated.txt
index 404ce7561cc47c..d435dc06d606d8 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/EmptyConfigType.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/EmptyConfigType.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -50,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (TypeWithNoMembers_Wrapper)instance;
+            var typedObj = (global::TypeWithNoMembers_Wrapper)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -58,13 +62,13 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
 
-        public static void BindCore(IConfiguration configuration, ref TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(TypeWithNoMembers_Wrapper), s_configKeys_TypeWithNoMembers_Wrapper, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::TypeWithNoMembers_Wrapper), s_configKeys_TypeWithNoMembers_Wrapper, configuration, binderOptions);
 
             if (AsConfigWithChildren(configuration.GetSection("Member")) is IConfigurationSection section0)
             {
-                instance.Member ??= new TypeWithNoMembers();
+                instance.Member ??= new global::TypeWithNoMembers();
             }
         }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/BindConfiguration.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/BindConfiguration.generated.txt
index f26695c7093969..e5b2254220fcf6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/BindConfiguration.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/BindConfiguration.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -83,9 +87,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -93,7 +97,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -104,9 +108,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -124,8 +128,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T.generated.txt
index 8d7c70a27b3f2e..1907c525993237 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -89,9 +93,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -99,7 +103,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -110,9 +114,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -130,8 +134,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T_BinderOptions.generated.txt
index 385079af1709a4..b3eb6354b5dbf5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Bind_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -83,9 +87,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -93,7 +97,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -104,9 +108,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -124,8 +128,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Primitives.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Primitives.generated.txt
index 6f189bf2e55ba2..90c6a72aa4e559 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Primitives.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Primitives.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -44,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -52,9 +56,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop28", "Prop29", "Prop30" });
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["Prop0"] is string value0)
             {
@@ -176,12 +180,12 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop17"] is string value14)
             {
-                instance.Prop17 = ParseCultureInfo(value14, () => configuration.GetSection("Prop17").Path);
+                instance.Prop17 = ParseSystemGlobalizationCultureInfo(value14, () => configuration.GetSection("Prop17").Path);
             }
 
             if (configuration["Prop19"] is string value15)
             {
-                instance.Prop19 = ParseDateTime(value15, () => configuration.GetSection("Prop19").Path);
+                instance.Prop19 = ParseSystemDateTime(value15, () => configuration.GetSection("Prop19").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -190,7 +194,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop20"] is string value16)
             {
-                instance.Prop20 = ParseDateTimeOffset(value16, () => configuration.GetSection("Prop20").Path);
+                instance.Prop20 = ParseSystemDateTimeOffset(value16, () => configuration.GetSection("Prop20").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -208,7 +212,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop23"] is string value18)
             {
-                instance.Prop23 = ParseTimeSpan(value18, () => configuration.GetSection("Prop23").Path);
+                instance.Prop23 = ParseSystemTimeSpan(value18, () => configuration.GetSection("Prop23").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -217,7 +221,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop24"] is string value19)
             {
-                instance.Prop24 = ParseGuid(value19, () => configuration.GetSection("Prop24").Path);
+                instance.Prop24 = ParseSystemGuid(value19, () => configuration.GetSection("Prop24").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -226,17 +230,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop25"] is string value20)
             {
-                instance.Prop25 = ParseUri(value20, () => configuration.GetSection("Prop25").Path);
+                instance.Prop25 = ParseSystemUri(value20, () => configuration.GetSection("Prop25").Path);
             }
 
             if (configuration["Prop26"] is string value21)
             {
-                instance.Prop26 = ParseVersion(value21, () => configuration.GetSection("Prop26").Path);
+                instance.Prop26 = ParseSystemVersion(value21, () => configuration.GetSection("Prop26").Path);
             }
 
             if (configuration["Prop27"] is string value22)
             {
-                instance.Prop27 = ParseEnum<DayOfWeek>(value22, () => configuration.GetSection("Prop27").Path);
+                instance.Prop27 = ParseEnum<global::System.DayOfWeek>(value22, () => configuration.GetSection("Prop27").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -259,7 +263,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop30"] is string value25)
             {
-                instance.Prop30 = ParseDateTime(value25, () => configuration.GetSection("Prop30").Path);
+                instance.Prop30 = ParseSystemDateTime(value25, () => configuration.GetSection("Prop30").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -446,7 +450,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -454,31 +458,31 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
 
-        public static DateTime ParseDateTime(string value, Func<string?> getPath)
+        public static global::System.DateTime ParseSystemDateTime(string value, Func<string?> getPath)
         {
             try
             {
-                return DateTime.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.DateTime.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(DateTime)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.DateTime)}'.", exception);
             }
         }
 
-        public static DateTimeOffset ParseDateTimeOffset(string value, Func<string?> getPath)
+        public static global::System.DateTimeOffset ParseSystemDateTimeOffset(string value, Func<string?> getPath)
         {
             try
             {
-                return DateTimeOffset.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.DateTimeOffset.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(DateTimeOffset)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.DateTimeOffset)}'.", exception);
             }
         }
 
@@ -494,31 +498,31 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static TimeSpan ParseTimeSpan(string value, Func<string?> getPath)
+        public static global::System.TimeSpan ParseSystemTimeSpan(string value, Func<string?> getPath)
         {
             try
             {
-                return TimeSpan.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.TimeSpan.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(TimeSpan)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.TimeSpan)}'.", exception);
             }
         }
 
-        public static Guid ParseGuid(string value, Func<string?> getPath)
+        public static global::System.Guid ParseSystemGuid(string value, Func<string?> getPath)
         {
             try
             {
-                return Guid.Parse(value);
+                return global::System.Guid.Parse(value);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Guid)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Guid)}'.", exception);
             }
         }
 
-        public static Uri ParseUri(string value, Func<string?> getPath)
+        public static global::System.Uri ParseSystemUri(string value, Func<string?> getPath)
         {
             try
             {
@@ -526,19 +530,19 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Uri)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Uri)}'.", exception);
             }
         }
 
-        public static Version ParseVersion(string value, Func<string?> getPath)
+        public static global::System.Version ParseSystemVersion(string value, Func<string?> getPath)
         {
             try
             {
-                return Version.Parse(value);
+                return global::System.Version.Parse(value);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Version)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Version)}'.", exception);
             }
         }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T.generated.txt
index 3e38a484c82552..88cf455949d50d 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -76,9 +80,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -86,7 +90,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -97,9 +101,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -111,17 +115,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -132,9 +136,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -152,24 +156,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_BinderOptions.generated.txt
index 186e93a49207b2..96b4208f6a07f5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -76,9 +80,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -86,7 +90,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -97,9 +101,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -111,17 +115,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -132,9 +136,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -152,24 +156,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name.generated.txt
index 7958adb1125338..77d46f40769aae 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -76,9 +80,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -86,7 +90,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -97,9 +101,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -111,17 +115,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -132,9 +136,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -152,24 +156,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
index b87d0c0a259cc8..c42a34af05204e 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -70,9 +74,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -80,7 +84,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -91,9 +95,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -105,17 +109,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -126,9 +130,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -146,24 +150,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Collections.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Collections.generated.txt
index b0210df5e044ef..b489907db90059 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Collections.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Collections.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -50,9 +54,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClassWithCustomCollections))
+            if (type == typeof(global::Program.MyClassWithCustomCollections))
             {
-                var instance = new Program.MyClassWithCustomCollections();
+                var instance = new global::Program.MyClassWithCustomCollections();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -60,7 +64,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.CustomDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.CustomDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -71,7 +75,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.CustomList instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.CustomList instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -82,7 +86,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             if (instance is not ICollection<int> temp)
             {
@@ -98,7 +102,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             if (instance is not IDictionary<string, int> temp)
             {
@@ -114,38 +118,38 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClassWithCustomCollections instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClassWithCustomCollections instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClassWithCustomCollections), s_configKeys_ProgramMyClassWithCustomCollections, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClassWithCustomCollections), s_configKeys_ProgramMyClassWithCustomCollections, configuration, binderOptions);
 
             if (AsConfigWithChildren(configuration.GetSection("CustomDictionary")) is IConfigurationSection section1)
             {
-                Program.CustomDictionary<string, int>? temp3 = instance.CustomDictionary;
-                temp3 ??= new Program.CustomDictionary<string, int>();
+                global::Program.CustomDictionary<string, int>? temp3 = instance.CustomDictionary;
+                temp3 ??= new global::Program.CustomDictionary<string, int>();
                 BindCore(section1, ref temp3, defaultValueIfNotFound: false, binderOptions);
                 instance.CustomDictionary = temp3;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("CustomList")) is IConfigurationSection section4)
             {
-                Program.CustomList? temp6 = instance.CustomList;
-                temp6 ??= new Program.CustomList();
+                global::Program.CustomList? temp6 = instance.CustomList;
+                temp6 ??= new global::Program.CustomList();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.CustomList = temp6;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("IReadOnlyList")) is IConfigurationSection section7)
             {
-                IReadOnlyList<int>? temp9 = instance.IReadOnlyList;
-                temp9 = temp9 is null ? (IReadOnlyList<int>)new List<int>() : (IReadOnlyList<int>)new List<int>(temp9);
+                global::System.Collections.Generic.IReadOnlyList<int>? temp9 = instance.IReadOnlyList;
+                temp9 = temp9 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>(temp9);
                 BindCore(section7, ref temp9, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyList = temp9;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("IReadOnlyDictionary")) is IConfigurationSection section10)
             {
-                IReadOnlyDictionary<string, int>? temp12 = instance.IReadOnlyDictionary;
-                temp12 = temp12 is null ? (IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (IReadOnlyDictionary<string, int>)temp12.ToDictionary(pair => pair.Key, pair => pair.Value);
+                global::System.Collections.Generic.IReadOnlyDictionary<string, int>? temp12 = instance.IReadOnlyDictionary;
+                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp12.ToDictionary(pair => pair.Key, pair => pair.Value);
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind.generated.txt
index c1c98b7d1e1623..da0c7375e13f62 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -41,7 +45,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
 
@@ -56,7 +60,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, GetBinderOptions(configureOptions));
         }
 
@@ -71,7 +75,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration.GetSection(key), ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -79,7 +83,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -90,7 +94,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -101,21 +105,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -133,24 +137,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance.generated.txt
index 8c961fff978132..336d1b5a9f4ca7 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -41,7 +45,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -49,7 +53,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -60,7 +64,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -71,21 +75,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -103,24 +107,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
index f7ea54e511a57d..80c908cedbee23 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Instance_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -41,7 +45,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, GetBinderOptions(configureOptions));
         }
         #endregion IConfiguration extensions.
@@ -49,7 +53,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -60,7 +64,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -71,21 +75,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -103,24 +107,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Key_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Key_Instance.generated.txt
index 22e430f70e6b79..592e8f14ae4101 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Key_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_Key_Instance.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -41,7 +45,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration.GetSection(key), ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -49,7 +53,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -60,7 +64,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -71,21 +75,21 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                if (!(instance.TryGetValue(section.Key, out Program.MyClass2? element) && element is not null))
+                if (!(instance.TryGetValue(section.Key, out global::Program.MyClass2? element) && element is not null))
                 {
-                    element = new Program.MyClass2();
+                    element = new global::Program.MyClass2();
                 }
                 instance[section.Key] = element;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value0)
             {
@@ -103,24 +107,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section2)
             {
-                List<int>? temp4 = instance.MyList;
-                temp4 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp4 = instance.MyList;
+                temp4 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section2, ref temp4, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp4;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section5)
             {
-                Dictionary<string, string>? temp7 = instance.MyDictionary;
-                temp7 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp7 = instance.MyDictionary;
+                temp7 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyComplexDictionary")) is IConfigurationSection section8)
             {
-                Dictionary<string, Program.MyClass2>? temp10 = instance.MyComplexDictionary;
-                temp10 ??= new Dictionary<string, Program.MyClass2>();
+                global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>? temp10 = instance.MyComplexDictionary;
+                temp10 ??= new global::System.Collections.Generic.Dictionary<string, global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyComplexDictionary = temp10;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
index 14753a4a1f8e4b..2a1453546c7bf9 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Bind_ParseTypeFromMethodParam.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get.generated.txt
index a050ddffd430f9..0c631bfc10e6ae 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -62,15 +66,15 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
-            else if (type == typeof(Program.MyClass2))
+            else if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -78,7 +82,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -106,7 +110,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp2.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -117,9 +121,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -137,8 +141,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
@@ -153,16 +157,16 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value14)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue.generated.txt
index cd7bd92c05b8d1..67df05b508e896 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -70,9 +74,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             {
                 return ParseByteArray(value, () => section.Path);
             }
-            else if (type == typeof(CultureInfo))
+            else if (type == typeof(global::System.Globalization.CultureInfo))
             {
-                return ParseCultureInfo(value, () => section.Path);
+                return ParseSystemGlobalizationCultureInfo(value, () => section.Path);
             }
 
             return null;
@@ -114,7 +118,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -122,7 +126,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
         #endregion Core binding extensions.
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key.generated.txt
index 1ebddd4bdc3ac7..678fa163a57c82 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
index 897a937ea31f6c..b546b86ea1b9b6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_T_Key_DefaultValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
index 8fd4c52ad6c933..706dec382c8635 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
index e5000774326125..772160a53bdd55 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/GetValue_TypeOf_Key_DefaultValue.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -46,15 +50,15 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(CultureInfo))
+            if (type == typeof(global::System.Globalization.CultureInfo))
             {
-                return ParseCultureInfo(value, () => section.Path);
+                return ParseSystemGlobalizationCultureInfo(value, () => section.Path);
             }
 
             return null;
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -62,7 +66,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
         #endregion Core binding extensions.
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_PrimitivesOnly.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
index 021a4ca8bef4ed..4934212d5836a5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_PrimitivesOnly.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T.generated.txt
index c054010f560a08..93766ec1d40508 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -49,9 +53,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -59,7 +63,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -87,7 +91,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp1.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -98,9 +102,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value2)
             {
@@ -118,8 +122,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section4)
             {
-                List<int>? temp6 = instance.MyList;
-                temp6 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp6 = instance.MyList;
+                temp6 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp6;
             }
@@ -134,8 +138,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section10)
             {
-                Dictionary<string, string>? temp12 = instance.MyDictionary;
-                temp12 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp12 = instance.MyDictionary;
+                temp12 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T_BinderOptions.generated.txt
index 9266520e105a61..caae5dfc5a8367 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -49,9 +53,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var instance = new Program.MyClass();
+                var instance = new global::Program.MyClass();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -59,7 +63,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -87,7 +91,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             temp1.CopyTo(instance, originalCount);
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -98,9 +102,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value2)
             {
@@ -118,8 +122,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section4)
             {
-                List<int>? temp6 = instance.MyList;
-                temp6 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp6 = instance.MyList;
+                temp6 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section4, ref temp6, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp6;
             }
@@ -134,8 +138,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section10)
             {
-                Dictionary<string, string>? temp12 = instance.MyDictionary;
-                temp12 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp12 = instance.MyDictionary;
+                temp12 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp12;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf.generated.txt
index 8818894f387c4b..9c28e846781de5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -49,9 +53,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass2))
+            if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -59,9 +63,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
index 6202545f7ae8d5..c2b86bd863e499 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Get_TypeOf_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -49,9 +53,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return null;
             }
 
-            if (type == typeof(Program.MyClass2))
+            if (type == typeof(global::Program.MyClass2))
             {
-                var instance = new Program.MyClass2();
+                var instance = new global::Program.MyClass2();
                 BindCore(configuration, ref instance, defaultValueIfNotFound: true, binderOptions);
                 return instance;
             }
@@ -59,9 +63,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/EmptyConfigType.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/EmptyConfigType.generated.txt
index 0bb9d336b81e9e..026724498ac82a 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/EmptyConfigType.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/EmptyConfigType.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -47,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (TypeWithNoMembers_Wrapper)instance;
+            var typedObj = (global::TypeWithNoMembers_Wrapper)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -55,13 +59,13 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
 
-        public static void BindCore(IConfiguration configuration, ref TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(TypeWithNoMembers_Wrapper), s_configKeys_TypeWithNoMembers_Wrapper, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::TypeWithNoMembers_Wrapper), s_configKeys_TypeWithNoMembers_Wrapper, configuration, binderOptions);
 
             if (AsConfigWithChildren(configuration.GetSection("Member")) is IConfigurationSection section0)
             {
-                instance.Member ??= new TypeWithNoMembers();
+                instance.Member ??= new global::TypeWithNoMembers();
             }
         }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/BindConfiguration.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/BindConfiguration.generated.txt
index 3199217c28a0ed..d09432aa258337 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/BindConfiguration.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/BindConfiguration.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -74,9 +78,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -84,7 +88,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -95,9 +99,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -115,8 +119,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T.generated.txt
index 76023bb8f04e26..1d116049774fe6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -80,9 +84,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -90,7 +94,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -101,9 +105,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -121,8 +125,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T_BinderOptions.generated.txt
index c6336da8dfaece..2a1abf7f17d363 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Bind_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -74,9 +78,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -84,7 +88,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -95,9 +99,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value1)
             {
@@ -115,8 +119,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section3)
             {
-                List<int>? temp5 = instance.MyList;
-                temp5 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp5 = instance.MyList;
+                temp5 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section3, ref temp5, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp5;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Primitives.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Primitives.generated.txt
index 2d42875b9f9961..fdbe79002b2d34 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Primitives.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Primitives.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -41,7 +45,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
                 return;
             }
 
-            var typedObj = (Program.MyClass)instance;
+            var typedObj = (global::Program.MyClass)instance;
             BindCore(configuration, ref typedObj, defaultValueIfNotFound: false, binderOptions: null);
         }
         #endregion IConfiguration extensions.
@@ -49,9 +53,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #region Core binding extensions.
         private readonly static Lazy<HashSet<string>> s_configKeys_ProgramMyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop7", "Prop11", "Prop12", "Prop18", "Prop22", "Prop28", "Prop29", "Prop30" });
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["Prop0"] is string value0)
             {
@@ -173,12 +177,12 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop17"] is string value14)
             {
-                instance.Prop17 = ParseCultureInfo(value14, () => configuration.GetSection("Prop17").Path);
+                instance.Prop17 = ParseSystemGlobalizationCultureInfo(value14, () => configuration.GetSection("Prop17").Path);
             }
 
             if (configuration["Prop19"] is string value15)
             {
-                instance.Prop19 = ParseDateTime(value15, () => configuration.GetSection("Prop19").Path);
+                instance.Prop19 = ParseSystemDateTime(value15, () => configuration.GetSection("Prop19").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -187,7 +191,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop20"] is string value16)
             {
-                instance.Prop20 = ParseDateTimeOffset(value16, () => configuration.GetSection("Prop20").Path);
+                instance.Prop20 = ParseSystemDateTimeOffset(value16, () => configuration.GetSection("Prop20").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -205,7 +209,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop23"] is string value18)
             {
-                instance.Prop23 = ParseTimeSpan(value18, () => configuration.GetSection("Prop23").Path);
+                instance.Prop23 = ParseSystemTimeSpan(value18, () => configuration.GetSection("Prop23").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -214,7 +218,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop24"] is string value19)
             {
-                instance.Prop24 = ParseGuid(value19, () => configuration.GetSection("Prop24").Path);
+                instance.Prop24 = ParseSystemGuid(value19, () => configuration.GetSection("Prop24").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -223,17 +227,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop25"] is string value20)
             {
-                instance.Prop25 = ParseUri(value20, () => configuration.GetSection("Prop25").Path);
+                instance.Prop25 = ParseSystemUri(value20, () => configuration.GetSection("Prop25").Path);
             }
 
             if (configuration["Prop26"] is string value21)
             {
-                instance.Prop26 = ParseVersion(value21, () => configuration.GetSection("Prop26").Path);
+                instance.Prop26 = ParseSystemVersion(value21, () => configuration.GetSection("Prop26").Path);
             }
 
             if (configuration["Prop27"] is string value22)
             {
-                instance.Prop27 = ParseEnum<DayOfWeek>(value22, () => configuration.GetSection("Prop27").Path);
+                instance.Prop27 = ParseEnum<global::System.DayOfWeek>(value22, () => configuration.GetSection("Prop27").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -242,7 +246,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop7"] is string value23)
             {
-                instance.Prop7 = ParseInt128(value23, () => configuration.GetSection("Prop7").Path);
+                instance.Prop7 = ParseSystemInt128(value23, () => configuration.GetSection("Prop7").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -251,7 +255,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop11"] is string value24)
             {
-                instance.Prop11 = ParseHalf(value24, () => configuration.GetSection("Prop11").Path);
+                instance.Prop11 = ParseSystemHalf(value24, () => configuration.GetSection("Prop11").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -260,7 +264,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop12"] is string value25)
             {
-                instance.Prop12 = ParseUInt128(value25, () => configuration.GetSection("Prop12").Path);
+                instance.Prop12 = ParseSystemUInt128(value25, () => configuration.GetSection("Prop12").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -269,7 +273,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop18"] is string value26)
             {
-                instance.Prop18 = ParseDateOnly(value26, () => configuration.GetSection("Prop18").Path);
+                instance.Prop18 = ParseSystemDateOnly(value26, () => configuration.GetSection("Prop18").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -278,7 +282,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop22"] is string value27)
             {
-                instance.Prop22 = ParseTimeOnly(value27, () => configuration.GetSection("Prop22").Path);
+                instance.Prop22 = ParseSystemTimeOnly(value27, () => configuration.GetSection("Prop22").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -301,7 +305,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (configuration["Prop30"] is string value30)
             {
-                instance.Prop30 = ParseDateTime(value30, () => configuration.GetSection("Prop30").Path);
+                instance.Prop30 = ParseSystemDateTime(value30, () => configuration.GetSection("Prop30").Path);
             }
             else if (defaultValueIfNotFound)
             {
@@ -488,7 +492,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static CultureInfo ParseCultureInfo(string value, Func<string?> getPath)
+        public static global::System.Globalization.CultureInfo ParseSystemGlobalizationCultureInfo(string value, Func<string?> getPath)
         {
             try
             {
@@ -496,31 +500,31 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(CultureInfo)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Globalization.CultureInfo)}'.", exception);
             }
         }
 
-        public static DateTime ParseDateTime(string value, Func<string?> getPath)
+        public static global::System.DateTime ParseSystemDateTime(string value, Func<string?> getPath)
         {
             try
             {
-                return DateTime.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.DateTime.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(DateTime)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.DateTime)}'.", exception);
             }
         }
 
-        public static DateTimeOffset ParseDateTimeOffset(string value, Func<string?> getPath)
+        public static global::System.DateTimeOffset ParseSystemDateTimeOffset(string value, Func<string?> getPath)
         {
             try
             {
-                return DateTimeOffset.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.DateTimeOffset.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(DateTimeOffset)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.DateTimeOffset)}'.", exception);
             }
         }
 
@@ -536,31 +540,31 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static TimeSpan ParseTimeSpan(string value, Func<string?> getPath)
+        public static global::System.TimeSpan ParseSystemTimeSpan(string value, Func<string?> getPath)
         {
             try
             {
-                return TimeSpan.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.TimeSpan.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(TimeSpan)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.TimeSpan)}'.", exception);
             }
         }
 
-        public static Guid ParseGuid(string value, Func<string?> getPath)
+        public static global::System.Guid ParseSystemGuid(string value, Func<string?> getPath)
         {
             try
             {
-                return Guid.Parse(value);
+                return global::System.Guid.Parse(value);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Guid)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Guid)}'.", exception);
             }
         }
 
-        public static Uri ParseUri(string value, Func<string?> getPath)
+        public static global::System.Uri ParseSystemUri(string value, Func<string?> getPath)
         {
             try
             {
@@ -568,79 +572,79 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Uri)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Uri)}'.", exception);
             }
         }
 
-        public static Version ParseVersion(string value, Func<string?> getPath)
+        public static global::System.Version ParseSystemVersion(string value, Func<string?> getPath)
         {
             try
             {
-                return Version.Parse(value);
+                return global::System.Version.Parse(value);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Version)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Version)}'.", exception);
             }
         }
 
-        public static Int128 ParseInt128(string value, Func<string?> getPath)
+        public static global::System.Int128 ParseSystemInt128(string value, Func<string?> getPath)
         {
             try
             {
-                return Int128.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.Int128.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Int128)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Int128)}'.", exception);
             }
         }
 
-        public static Half ParseHalf(string value, Func<string?> getPath)
+        public static global::System.Half ParseSystemHalf(string value, Func<string?> getPath)
         {
             try
             {
-                return Half.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.Half.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(Half)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.Half)}'.", exception);
             }
         }
 
-        public static UInt128 ParseUInt128(string value, Func<string?> getPath)
+        public static global::System.UInt128 ParseSystemUInt128(string value, Func<string?> getPath)
         {
             try
             {
-                return UInt128.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.UInt128.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(UInt128)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.UInt128)}'.", exception);
             }
         }
 
-        public static DateOnly ParseDateOnly(string value, Func<string?> getPath)
+        public static global::System.DateOnly ParseSystemDateOnly(string value, Func<string?> getPath)
         {
             try
             {
-                return DateOnly.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.DateOnly.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(DateOnly)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.DateOnly)}'.", exception);
             }
         }
 
-        public static TimeOnly ParseTimeOnly(string value, Func<string?> getPath)
+        public static global::System.TimeOnly ParseSystemTimeOnly(string value, Func<string?> getPath)
         {
             try
             {
-                return TimeOnly.Parse(value, CultureInfo.InvariantCulture);
+                return global::System.TimeOnly.Parse(value, CultureInfo.InvariantCulture);
             }
             catch (Exception exception)
             {
-                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(TimeOnly)}'.", exception);
+                throw new InvalidOperationException($"Failed to convert configuration value at '{getPath()}' to type '{typeof(global::System.TimeOnly)}'.", exception);
             }
         }
 
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T.generated.txt
index 5d5b84cc1765ae..1bfbbdf6594751 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -70,9 +74,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -80,7 +84,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -91,9 +95,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -105,17 +109,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -126,9 +130,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -146,24 +150,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_BinderOptions.generated.txt
index 9c75578aef9f79..8004628b3c4198 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -70,9 +74,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -80,7 +84,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -91,9 +95,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -105,17 +109,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -126,9 +130,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -146,24 +150,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name.generated.txt
index 6d396b26bdefd8..98e11998663ebf 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -70,9 +74,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -80,7 +84,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -91,9 +95,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -105,17 +109,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -126,9 +130,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -146,24 +150,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
index 2834491e351352..18b8b3b21dcd7d 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Configure_T_name_BinderOptions.generated.txt
@@ -1,6 +1,10 @@
 // <auto-generated/>
-#nullable enable
-#pragma warning disable CS0612, CS0618 // Suppress warnings about [Obsolete] member usage in generated code.
+
+#nullable enable annotations
+#nullable disable warnings
+
+// Suppress warnings about [Obsolete] member usage in generated code.
+#pragma warning disable CS0612, CS0618
 
 namespace System.Runtime.CompilerServices
 {
@@ -64,9 +68,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             BinderOptions? binderOptions = GetBinderOptions(configureOptions);
 
-            if (type == typeof(Program.MyClass))
+            if (type == typeof(global::Program.MyClass))
             {
-                var temp = (Program.MyClass)instance;
+                var temp = (global::Program.MyClass)instance;
                 BindCore(configuration, ref temp, defaultValueIfNotFound: false, binderOptions);
                 return;
             }
@@ -74,7 +78,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             throw new NotSupportedException($"Unable to bind to type '{type}': generator did not detect the type as input.");
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -85,9 +89,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass2 instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass2), s_configKeys_ProgramMyClass2, configuration, binderOptions);
 
             if (configuration["MyInt"] is string value1)
             {
@@ -99,17 +103,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref List<Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<global::Program.MyClass2> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
-                var value = new Program.MyClass2();
+                var value = new global::Program.MyClass2();
                 BindCore(section, ref value, defaultValueIfNotFound: false, binderOptions);
                 instance.Add(value);
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.Dictionary<string, string> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
             foreach (IConfigurationSection section in configuration.GetChildren())
             {
@@ -120,9 +124,9 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             }
         }
 
-        public static void BindCore(IConfiguration configuration, ref Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
+        public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            ValidateConfigurationKeys(typeof(Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
+            ValidateConfigurationKeys(typeof(global::Program.MyClass), s_configKeys_ProgramMyClass, configuration, binderOptions);
 
             if (configuration["MyString"] is string value3)
             {
@@ -140,24 +144,24 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             if (AsConfigWithChildren(configuration.GetSection("MyList")) is IConfigurationSection section5)
             {
-                List<int>? temp7 = instance.MyList;
-                temp7 ??= new List<int>();
+                global::System.Collections.Generic.List<int>? temp7 = instance.MyList;
+                temp7 ??= new global::System.Collections.Generic.List<int>();
                 BindCore(section5, ref temp7, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList = temp7;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyList2")) is IConfigurationSection section8)
             {
-                List<Program.MyClass2>? temp10 = instance.MyList2;
-                temp10 ??= new List<Program.MyClass2>();
+                global::System.Collections.Generic.List<global::Program.MyClass2>? temp10 = instance.MyList2;
+                temp10 ??= new global::System.Collections.Generic.List<global::Program.MyClass2>();
                 BindCore(section8, ref temp10, defaultValueIfNotFound: false, binderOptions);
                 instance.MyList2 = temp10;
             }
 
             if (AsConfigWithChildren(configuration.GetSection("MyDictionary")) is IConfigurationSection section11)
             {
-                Dictionary<string, string>? temp13 = instance.MyDictionary;
-                temp13 ??= new Dictionary<string, string>();
+                global::System.Collections.Generic.Dictionary<string, string>? temp13 = instance.MyDictionary;
+                temp13 ??= new global::System.Collections.Generic.Dictionary<string, string>();
                 BindCore(section11, ref temp13, defaultValueIfNotFound: false, binderOptions);
                 instance.MyDictionary = temp13;
             }
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.Helpers.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.Helpers.cs
index b5c8cc534f693d..24285047fff900 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.Helpers.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.Helpers.cs
@@ -138,7 +138,11 @@ private static async Task<ConfigBindingGenRunResult> VerifyAgainstBaselineUsingF
                 string source = string.Join(Environment.NewLine, lines).TrimEnd(Environment.NewLine.ToCharArray()) + Environment.NewLine;
                 path = Path.Combine($"{repoRootDir}\\src\\libraries\\Microsoft.Extensions.Configuration.Binder\\tests\\SourceGenerationTests\\", path);
 
-                await File.WriteAllTextAsync(path, source).ConfigureAwait(false);
+#if NETCOREAPP
+                await File.WriteAllTextAsync(path, source);
+#else
+                File.WriteAllText(path, source);
+#endif
                 resultEqualsBaseline = true;
             }
 #endif
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
index 741ed473179407..f2cc5155789ae0 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
@@ -176,6 +176,33 @@ public class MyClass { }
             }
         }
 
+        [Fact]
+        public async Task SucceedWhenGivenConflictingTypeNames()
+        {
+            // Regression test for https://github.com/dotnet/runtime/issues/93498
+
+            string source = """
+                using Microsoft.Extensions.Configuration;
+
+                var c = new ConfigurationBuilder().Build();
+                c.Get<Foo.Bar.BType>();
+
+                namespace Microsoft.Foo
+                {
+                    internal class AType {}
+                }
+
+                namespace Foo.Bar
+                {
+                    internal class BType {}
+                }
+                """;
+
+            ConfigBindingGenRunResult result = await RunGeneratorAndUpdateCompilation(source);
+            Assert.NotNull(result.GeneratedSource);
+            Assert.Empty(result.Diagnostics);
+        }
+
         [Fact]
         public async Task SucceedWhenGivenMinimumRequiredReferences()
         {