tcpipSocket/Chat/Client/RoomListForm.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 RoomListForm : Form
	{
		public RoomListForm()
		{
			InitializeComponent();
		}

		private void btnEnter_Click(object sender, EventArgs e)
		{
			if (lbxRoom.SelectedItem == null)
			{
				MessageBox.Show("Please select a room.");
				return;
			}

			ChatRoomForm chatRoomForm = new ChatRoomForm();
			chatRoomForm.Text = lbxRoom.SelectedItem.ToString();
			chatRoomForm.ShowDialog();
		}

		private void btnCreate_Click(object sender, EventArgs e)
		{
			string roomName = tbxRoomName.Text;
			if (string.IsNullOrEmpty(roomName))
			{
				MessageBox.Show("Please input a room name.");
				return;
			}

			ChatRoomForm chatRoomForm = new ChatRoomForm();
			chatRoomForm.Text = roomName;
			chatRoomForm.ShowDialog();
		}

		private void RoomListForm_Activated(object sender, EventArgs e)
		{
			lbxRoom.Items.Clear();
		}
	}
}