address pr feedback

sdk/core/System.ClientModel/src/Convenience/ClientResult.cs

@@ -12,7 +12,7 @@ public class ClientResult
 
     protected ClientResult(PipelineResponse response)
     {
-        ClientUtilities.AssertNotNull(response, nameof(response));
+        Argument.AssertNotNull(response, nameof(response));
 
         _response = response;
     }

sdk/core/System.ClientModel/src/Convenience/ClientResultException.cs

@@ -29,7 +29,7 @@ public int Status
     public ClientResultException(PipelineResponse response, Exception? innerException = default)
         : base(CreateMessage(response), innerException)
     {
-        ClientUtilities.AssertNotNull(response, nameof(response));
+        Argument.AssertNotNull(response, nameof(response));
 
         _response = response;
         _status = response.Status;
@@ -56,7 +56,7 @@ protected ClientResultException(SerializationInfo info, StreamingContext context
     /// <inheritdoc />
     public override void GetObjectData(SerializationInfo info, StreamingContext context)
     {
-        ClientUtilities.AssertNotNull(info, nameof(info));
+        Argument.AssertNotNull(info, nameof(info));
 
         info.AddValue(nameof(Status), Status);
 

sdk/core/System.ClientModel/src/Convenience/KeyCredential.cs

@@ -31,7 +31,7 @@ public class KeyCredential
 
     public void Update(string key)
     {
-        ClientUtilities.AssertNotNullOrEmpty(key, nameof(key));
+        Argument.AssertNotNullOrEmpty(key, nameof(key));
 
         Volatile.Write(ref _key, key);
     }

sdk/core/System.ClientModel/src/Internal/StreamExtensions.cs

@@ -14,7 +14,7 @@ internal static class StreamExtensions
 {
     public static async Task WriteAsync(this Stream stream, ReadOnlyMemory<byte> buffer, CancellationToken cancellation = default)
     {
-        ClientUtilities.AssertNotNull(stream, nameof(stream));
+        Argument.AssertNotNull(stream, nameof(stream));
 #if NETCOREAPP
         await stream.WriteAsync(buffer, cancellation).ConfigureAwait(false);
 #else
@@ -48,7 +48,7 @@ public static async Task WriteAsync(this Stream stream, ReadOnlyMemory<byte> buf
 
     public static async Task WriteAsync(this Stream stream, ReadOnlySequence<byte> buffer, CancellationToken cancellation = default)
     {
-        ClientUtilities.AssertNotNull(stream, nameof(stream));
+        Argument.AssertNotNull(stream, nameof(stream));
 
         if (buffer.Length == 0)
             return;