diff --git a/playground/ParameterEndToEnd/ParameterEndToEnd.AppHost/Program.cs b/playground/ParameterEndToEnd/ParameterEndToEnd.AppHost/Program.cs
index b41a503167b..33330038ffc 100644
--- a/playground/ParameterEndToEnd/ParameterEndToEnd.AppHost/Program.cs
+++ b/playground/ParameterEndToEnd/ParameterEndToEnd.AppHost/Program.cs
@@ -21,7 +21,7 @@
 
 var insertionrows = builder.AddParameter("insertionrows");
 
-var cs = builder.AddConnectionString("cs", $"sql={db};rows={insertionrows}");
+var cs = builder.AddConnectionString("cs", ReferenceExpression.Create($"sql={db};rows={insertionrows}"));
 
 builder.AddProject<Projects.ParameterEndToEnd_ApiService>("api")
        .WithExternalHttpEndpoints()
diff --git a/src/Aspire.Hosting/ConnectionStringBuilderExtensions.cs b/src/Aspire.Hosting/ConnectionStringBuilderExtensions.cs
index c7ce662b961..471b459ad14 100644
--- a/src/Aspire.Hosting/ConnectionStringBuilderExtensions.cs
+++ b/src/Aspire.Hosting/ConnectionStringBuilderExtensions.cs
@@ -50,29 +50,4 @@ public static IResourceBuilder<ConnectionStringResource> AddConnectionString(thi
                           Properties = []
                       });
     }
-
-    /// <summary>
-    /// Adds a connection string to the distributed application a resource with the specified expression.
-    /// </summary>
-    /// <remarks>
-    /// This method also enables appending custom data to the connection string based on other resources that expose connection strings.
-    /// </remarks>
-    /// <param name="builder">Distributed application builder</param>
-    /// <param name="name">The name of the resource.</param>
-    /// <param name="connectionStringExpression">The connection string expression.</param>
-    /// <returns>An <see cref="IResourceBuilder{ConnectionStringResource}"/> instance.</returns>
-    /// <example>
-    /// <code language="csharp">
-    /// var builder = DistributedApplication.CreateBuilder(args);
-    ///
-    /// var endpoint = builder.AddParameter("endpoint", "http://localhost:3452");
-    /// var key = builder.AddParameter("key", secret: true);
-    /// 
-    /// builder.AddConnectionString("myconnection", $"Endpoint={endpoint};Key={key}");
-    /// </code>
-    /// </example>
-    public static IResourceBuilder<ConnectionStringResource> AddConnectionString(this IDistributedApplicationBuilder builder, [ResourceName] string name, ReferenceExpression.ExpressionInterpolatedStringHandler connectionStringExpression)
-    {
-        return builder.AddConnectionString(name, ReferenceExpression.Create(connectionStringExpression));
-    }
 }
diff --git a/tests/Aspire.Hosting.Tests/AddParameterTests.cs b/tests/Aspire.Hosting.Tests/AddParameterTests.cs
index 1f79aac493c..1e162630649 100644
--- a/tests/Aspire.Hosting.Tests/AddParameterTests.cs
+++ b/tests/Aspire.Hosting.Tests/AddParameterTests.cs
@@ -329,7 +329,7 @@ public async Task AddConnectionStringExpressionIsAValueInTheManifest()
         var key = appBuilder.AddParameter("key", "secretKey", secret: true);
 
         // Get the service provider.
-        appBuilder.AddConnectionString("mycs", $"Endpoint={endpoint};Key={key}");
+        appBuilder.AddConnectionString("mycs", ReferenceExpression.Create($"Endpoint={endpoint};Key={key}"));
 
         using var app = appBuilder.Build();
 
diff --git a/tests/Aspire.Hosting.Tests/WaitForTests.cs b/tests/Aspire.Hosting.Tests/WaitForTests.cs
index 8a806ba3ac8..12b166cc714 100644
--- a/tests/Aspire.Hosting.Tests/WaitForTests.cs
+++ b/tests/Aspire.Hosting.Tests/WaitForTests.cs
@@ -125,7 +125,7 @@ public async Task WaitingForConnectionStringResourceWaitsForReferencedResources(
         using var builder = TestDistributedApplicationBuilder.Create(testOutputHelper);
 
         var dependency = builder.AddResource(new CustomResource("test"));
-        var cs = builder.AddConnectionString("cs", $"{dependency};Timeout=100");
+        var cs = builder.AddConnectionString("cs", ReferenceExpression.Create($"{dependency};Timeout=100"));
 
         var nginx = builder.AddContainer("nginx", "mcr.microsoft.com/cbl-mariner/base/nginx", "1.22")
                            .WaitFor(cs);
diff --git a/tests/Aspire.Hosting.Tests/WithReferenceTests.cs b/tests/Aspire.Hosting.Tests/WithReferenceTests.cs
index 1495511f227..43f93802e8f 100644
--- a/tests/Aspire.Hosting.Tests/WithReferenceTests.cs
+++ b/tests/Aspire.Hosting.Tests/WithReferenceTests.cs
@@ -270,28 +270,6 @@ public async Task ConnectionStringResourceWithExpressiononnectionString()
         Assert.Equal("Endpoint=http://localhost:3452;Key=secretKey", config["ConnectionStrings__cs"]);
     }
 
-    [Fact]
-    public async Task ConnectionStringResourceWithInterpolated()
-    {
-        using var builder = TestDistributedApplicationBuilder.Create();
-
-        var endpoint = builder.AddParameter("endpoint", "http://localhost:3452");
-        var key = builder.AddParameter("key", "secretKey", secret: true);
-
-        // Get the service provider.
-        var resource = builder.AddConnectionString("cs", $"Endpoint={endpoint};Key={key}");
-
-        var projectB = builder.AddProject<ProjectB>("projectb")
-                              .WithReference(resource);
-
-        // Call environment variable callbacks.
-        var config = await EnvironmentVariableEvaluator.GetEnvironmentVariablesAsync(projectB.Resource, DistributedApplicationOperation.Run, TestServiceProvider.Instance).DefaultTimeout();
-
-        var servicesKeysCount = config.Keys.Count(k => k.StartsWith("ConnectionStrings__"));
-        Assert.Equal(1, servicesKeysCount);
-        Assert.Equal("Endpoint=http://localhost:3452;Key=secretKey", config["ConnectionStrings__cs"]);
-    }
-
     [Fact]
     public async Task ConnectionStringResourceWithConnectionStringOverwriteName()
     {
diff --git a/tests/TestingAppHost1/TestingAppHost1.AppHost/Program.cs b/tests/TestingAppHost1/TestingAppHost1.AppHost/Program.cs
index 85ab0adc9c4..152644fbceb 100644
--- a/tests/TestingAppHost1/TestingAppHost1.AppHost/Program.cs
+++ b/tests/TestingAppHost1/TestingAppHost1.AppHost/Program.cs
@@ -11,7 +11,7 @@
 
 builder.AddConnectionString("cs");
 
-builder.AddConnectionString("cs2", $"Value={builder.AddParameter("p", "this is a value")}");
+builder.AddConnectionString("cs2", ReferenceExpression.Create($"Value={builder.AddParameter("p", "this is a value")}"));
 
 if (args.Contains("--add-redis"))
 {