var callOptions = new CallOptions()
                .WithDeadline(DateTime.UtcNow.AddTicks(100000))
                .WithHeaders(Metadata.Empty);

                Channel channel = new Channel(comboBox_RemoteIp.Text + ":" + comboBox_RemotePort.Text
                                        , ChannelCredentials.Insecure);
                var client = new Greeter.GreeterClient(channel);
                String user = "JK";
                var reply = client.SayHello(new HelloRequest { Name = user }, callOptions);