{

this.label1.Text+=ex.ToString();

}

}

// while(byteMessage!=null);

}

//开始监听

private void button1_Click(object sender, System.EventArgs e)

{

try

{

mythread = new Thread(new ThreadStart(BeginListen));

mythread.Start();

}

catch(System.Exception er)

{

MessageBox.Show(er.Message,"完成",MessageBoxButtons.OK,MessageBoxIcon.Stop);

}

}

//客户端：

using System.Net;

using System.Net.Sockets;

using System.Text;

private void button1_Click(object sender, System.EventArgs e)

{

BeginSend();

}

private void BeginSend()

{

string ip=this.txtip.Text;

string port=this.txtport.Text;

IPAddress serverIp=IPAddress.Parse(ip);

int serverPort=Convert.ToInt32(port);

IPEndPoint iep=new IPEndPoint(serverIp,serverPort);

byte[] byteMessage;

// do

// {

Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

socket.Connect(iep);

byteMessage=Encoding.ASCII.GetBytes(textBox1.Text);

socket.Send(byteMessage);

socket.Shutdown(SocketShutdown.Both);

socket.Close();

// }

// while(byteMessage!=null);

}

基于TCP协议的发送和接收端

TCP协议的接收端

using System.Net.Sockets ; //使用到TcpListen类