Replace handwritten math stub by the generated one
diff --git a/src/csharp/Grpc.Examples.MathClient/MathClient.cs b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
index ca7683d..85d9cdc 100644
--- a/src/csharp/Grpc.Examples.MathClient/MathClient.cs
+++ b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
@@ -43,7 +43,7 @@
 
             using (Channel channel = new Channel("127.0.0.1:23456"))
             {
-                MathGrpc.IMathServiceClient stub = new MathGrpc.MathServiceClientStub(channel);
+                Math.IMathClient stub = new Math.MathClient(channel);
                 MathExamples.DivExample(stub);
 
                 MathExamples.DivAsyncExample(stub).Wait();