{
   try
      {
	tlTcpListen = new TcpListener ( port )  ;
	//以8000端口号来初始化TcpListener实例
	tlTcpListen.Start ( )  ;
	//开始监听网络的连接请求
	statusBar1.Text = "正在监听..."  ;
	stRead = tlTcpListen.AcceptSocket ( ) ;
	//通过连接请求，并获得接收数据时使用的Socket实例
	EndPoint tempRemoteEP = stRead.RemoteEndPoint  ;
	IPEndPoint tempRemoteIP =  ( IPEndPoint ) tempRemoteEP ;
	//获取请求的远程计算机名称
	IPHostEntry host = Dns.GetHostByAddress
         ( tempRemoteIP.Address ) ;
	string sHostName = host.HostName ;
	statusBar1.Text = "已经连接！" ;
	//循环侦听
	while (  blistener  )
	   {
	     string sTime = DateTime.Now.ToShortTimeString  ( )  ;
		//获取接收数据时的时间
		Byte [ ] byRead =new Byte [ 80 ] ;
		int iRead = stRead.ReceiveFrom 
                  ( byRead , ref tempRemoteEP ) ;
		//获得接收的字节数目
		Byte [ ] byText = new Byte [ iRead ] ;
		//并根据接收到的字节数目来定义字节数组
		Array.Copy  ( byRead , 0 , byText , 0 , iRead ) ;
		string sTemp = System.Text.Encoding.Default.
                   GetString ( byText ) ;
		//判断是否为断开连接控制码
		if  (  sTemp.Trim ( )  == "STOP"  )
		{
			stRead.Close ( ) ;
			tlTcpListen.Stop  (  )  ;
			 //关闭侦听
			statusBar1.Text = "连接已经关闭！"  ;
			thThreadRead.Abort  (   )  ;
			//中止线程
			return ;
		}
		else
		listBox1.Items.Add  (  sTime + " " + sTemp  )  ;
		
	}	catch  (  System.Security.SecurityException  ) 
	{
	MessageBox.Show  (  "侦听失败！"  , "错误"  )  ;
	}
}

private void button1_Click ( object sender , System.EventArgs e )
{
thThreadRead = new Thread ( new ThreadStart ( Listen ) ) ;
//以Listen过程来初始化Thread实例
thThreadRead.Start (   ) ;
//启动线程
button1.Enabled = false  ;
}