MSDN
实例
//
This constructor arbitrarily assigns the local port number.
    UdpClient
udpClient = new UdpClient(11000);

   
try{
        
udpClient.Connect(“www.contoso.com“, 11000);

        
// Sends a message to the host to which you have connected.
        
Byte[] sendBytes = Encoding.ASCII.GetBytes(“Is anybody there?”);
      
        
udpClient.Send(sendBytes, sendBytes.Length);

        
// Sends a message to a different host using optional hostname and port
parameters.
        
UdpClient udpClientB = new UdpClient();
        
udpClientB.Send(sendBytes, sendBytes.Length, “AlternateHostMachineName”,
11000);

        
//IPEndPoint object will allow us to read datagrams sent from any source.
        
IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);

        
// Blocks until a message returns on this socket from a remote host.
        
Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint); 
        
string returnData = Encoding.ASCII.GetString(receiveBytes);
   
        
// Uses the IPEndPoint object to determine which of these two hosts
responded.
        
Console.WriteLine(“This is the message you received ” + returnData.ToString());
        
Console.WriteLine(“This message was sent from ” + RemoteIpEndPoint.Address.ToString() +
                                    
” on their port number ” +
                                    
RemoteIpEndPoint.Port.ToString());

         
udpClient.Close();
         
udpClientB.Close();
          
      }  
      catch (Exception e ) {
          Console.WriteLine(e.ToString());
      }

 
Microsoft
Visual Studio 2005/.NET Framework 2.0