tcpipSocket/Chat/Client/ChatRoomForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Client
{
	public partial class ChatRoomForm : Form
	{
		public ChatRoomForm()
		{
			InitializeComponent();
		}

		private void btmSend_Click(object sender, EventArgs e)
		{
			if (string.IsNullOrEmpty(tbxMsg.Text))
				return;

			lbxMsg.Items.Add(tbxMsg.Text);
			tbxMsg.Text = null;

			ScrollMsgToEnd();
		}

		private void ScrollMsgToEnd()
		{
			lbxMsg.SelectedIndex = lbxMsg.Items.Count - 1;
			lbxMsg.SelectedIndex = -1;
		}
	}
}