c# UDP

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Socket s;
EndPoint x;
private void button1_Click(object sender, EventArgs e)
{

//服务器
string ip = this.textBox1.Text;
int p = int.Parse(this.textBox2.Text);
IPAddress ips = IPAddress.Parse(ip);
IPEndPoint ps = new IPEndPoint(ips, p);
s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Udp);
s.Bind(ps);

//客户机IP
string ip1 = this.textBox4.Text;
int p1 = int.Parse(this.textBox3.Text);
int px = int.Parse(this.textBox2.Text);
IPAddress ipsx = IPAddress.Parse(ip1);
IPEndPoint psx = new IPEndPoint(ipsx, p1);
x = (EndPoint)psx;

//使用线程处理数据接受
//接受UDP数据报，引用参数X获得源地址
Thread th = new Thread(new ThreadStart(Receive));
th.IsBackground = true;
th.Start();

}
public delegate void myInvoke(string s);
void Receive()
{
string msg;
byte[] data = new byte[1024];
myInvoke my = new myInvoke(showmsg);
while (true)
{
if (s == null || s.Available < 1)
{
Thread.Sleep(200);
continue;
}
//跨线程调用控件
//接受UDP数据包，引用参数X源地址
int re=s.ReceiveFrom(data,ref x);
msg=Encoding.Default.GetString(data,0,re);
this.textBox5.BeginInvoke(my,new object[] {x.ToString()+":"+msg});
}

}

void showmsg(string msg)
{
this.textBox5.AppendText(msg + "\r\n");
}

private void button2_Click(object sender, EventArgs e)
{
string msg;
msg = this.textBox6.Text;
byte[] data = Encoding.Default.GetBytes(msg);
s.SendTo(data,data.Length,SocketFlags.None,x);
}
}
}