Reworked GrpcEnvironment initialization and shutdown to allow running all tests at once.
diff --git a/src/csharp/MathClient/MathClient.cs b/src/csharp/MathClient/MathClient.cs
index 45222ab..52dd2a5 100644
--- a/src/csharp/MathClient/MathClient.cs
+++ b/src/csharp/MathClient/MathClient.cs
@@ -9,6 +9,8 @@
     {
 		public static void Main (string[] args)
 		{
+            GrpcEnvironment.Initialize();
+
 			using (Channel channel = new Channel("127.0.0.1:23456"))
 			{
 				MathGrpc.IMathServiceClient stub = new MathGrpc.MathServiceClientStub(channel);