Fix some keyword errors

examples/CSharp/Example/Program.cs

@@ -41,6 +41,10 @@ class TestSrvimpl : Example.TestServiceServer<int>
       throw new Exception("This is a remote error :)");
    }
 
+   public override Task<double> FunctionWithKeywords(double type, double static_, double event_, int ctx)
+   {
+      throw new NotImplementedException();
+   }
 }
 
 class CopyTransportS2 : Example.JRpcTransport