private void ActivateButton_Click(object sender, RoutedEventArgs e) { var channel = new Channel("localhost", DefaultPort, ChannelCredentials.Insecure); var client = new Commander.CommanderClient(channel); var result = client.Activate(new Empty()); MessageTextBox.Foreground = result.Success ? Brushes.Black : Brushes.Red; MessageTextBox.Text = result.Message; }