private async void btn_send_Click(object sender, RoutedEventArgs e) { if (isConnected == false) { MessageBox.Show("Ups! You forgot to connect!", "Error!"); } else { if (txt_message.Text.ToString() == "") { MessageBox.Show("Ups! You forgot to enter your message!", "Error!"); } else { clientMessage.Name = client.Name; clientMessage.Textmessage = txt_message.Text.ToString(); var chat = new ChatService.ChatServiceClient(channel); chat.sendMessage(clientMessage); UpdateChat(); if (stream != null) { await stream.RequestStream.WriteAsync(clientMessage); } } } }