private void ButtonLogin_Click(object sender, RoutedEventArgs e)
        {
            client.NewHandler("sym");



            bool auth = client.Login(this.TextBoxName.Text, this.TextBoxPassword.Text); //client knows about username

            if (auth)
            {
                ChatWindow chat = new ChatWindow();

                chat.AddService(client);
                chat.SetUpUser();

                chat.Title = this.TextBoxName.Text;
                chat.Show();
            }
            else
            {
                MessageBox.Show("Sorry, incorrect username or password. Try again.");
            }
        }