static void Main(string[] args) 
{ 
  UdpClient client = null; 
  string receiveString = null; 
  byte[] receiveData = null; 
  //實例化一個遠程端點，IP和端口可以隨意指定，等調(diào)用client.Receive(ref remotePoint)時會將該端點改成真正發(fā)送端端點 
  IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0); 

  while (true) 
  { 
 client = new UdpClient(11000); 
 receiveData = client.Receive(ref remotePoint);//接收數(shù)據(jù) 
 receiveString = Encoding.Default.GetString(receiveData); 
 Console.WriteLine(receiveString); 
 client.Close();//關(guān)閉連接 
  } 
}

static void Main(string[] args) 
{ 
  string sendString = null;//要發(fā)送的字符串 
  byte[] sendData = null;//要發(fā)送的字節(jié)數(shù)組 
  UdpClient client = null; 

  IPAddress remoteIP = IPAddress.Parse("127.0.0.1"); 
  int remotePort = 11000; 
  IPEndPoint remotePoint = new IPEndPoint(remoteIP, remotePort);//實例化一個遠程端點 

  while (true) 
  { 
 sendString = Console.ReadLine(); 
 sendData = Encoding.Default.GetBytes(sendString); 

 client = new UdpClient(); 
 client.Send(sendData, sendData.Length, remotePoint);//將數(shù)據(jù)發(fā)送到遠程端點 
 client.Close();//關(guān)閉連接 
  } 
}