private void button1_Click 
( object sender , System.EventArgs e )
{
	//以下代码是判断是否和远程终结点成功连接
	try
	{
		stSend = new Socket ( AddressFamily.InterNetwork , 
                  SocketType.Stream , ProtocolType.Tcp ) ;
		//初始化一个Socket实例
		IPEndPoint tempRemoteIP = new IPEndPoint 
                  ( IPAddress.Parse ( textBox1.Text ) , port ) ;
		//根据IP地址和端口号创建远程终结点
		EndPoint epTemp =  ( EndPoint ) tempRemoteIP ;
		stSend.Connect ( epTemp ) ;
		//连接远程主机的8000端口号
		statusBar1.Text = "成功连接远程计算机！" ;
		tcpConnect = true ;
		button1.Enabled = false  ;
		button2.Enabled = true  ;
	}
	catch ( Exception )
	{
		statusBar1.Text = "目标计算机拒绝连接请求！" ;
	}	
}

private void button2_Click 
( object sender , System.EventArgs e )
{
	int iLength = textBox2.Text.Length ;
	//获取要发送的数据的长度
	Byte [ ] bySend = new byte [ iLength ] ;
	//根据获取的长度定义一个Byte类型数组
	bySend = System.Text.Encoding.Default.GetBytes 
         ( textBox2.Text  ) ;
	//按照指定编码类型把字符串指定到指定的Byte数组
	int i = stSend.Send  ( bySend ) ;
	//发送数据
	listBox1.Items.Add  ( textBox2.Text  ) ;
}

protected override void Dispose (  bool disposing  )
{
	if  (  tcpConnect  )
	{
		Byte [ ] bySend = new byte [ 4 ] ;
		//根据字符串“STOP”长度来定义Byte数组
		bySend = System.Text.Encoding.
                  Default.GetBytes ( "STOP" ) ;
		int i = stSend.Send  ( bySend ) ;
		//发送控制码
		stSend.Close ( ) ;
		//关闭套接字
	}
	if (  disposing  )
	{
		if  ( components != null ) 
		{
			components.Dispose ( ) ;
		}
	}
	base.Dispose (  disposing  ) ;
}