C# TCP 服务端(PC)与客户端(PPC) 简单代码

服务器端代码
控件：btnStart_Click，btnSend_Click，label4，textBox1
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Threading;
using System.Net.Sockets;
using System.Net;
namespace MobileServer
{
    public partial class FrmEasy : Form
    {
        //变量
        private ThreadStart start;
        private Thread listenThread,client_th;
        static private bool m_bListening = false;
        //static private System.Net.IPAddress MyIP = System.Net.IPAddress.Parse("192.168.1.3");
        //获得当前服务端的IP    地址
        static private System.Net.IPAddress MyIP = Dns.Resolve(Dns.GetHostName()).AddressList[0];
        static private TcpListener listener = new TcpListener(MyIP, 5567);
        private String msg;
        ArrayList clientArray = new ArrayList();
        public FrmEasy()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
            start = new ThreadStart(startListen);
            listenThread = new Thread(start);
        }
        private void btnStart_Click(objec