static void Main(string[] args)
        {            
            IPEndPoint udpPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4505);
            UdpClient udpClient = new UdpClient(udpPoint);
            //UdpClient udpClient = new UdpClient(); 匿名发送,自动分配本地IPv4地址udpcSend = new UdpClient(0); 
            string sendMsg = "Hello UDP Server.";
            byte[] sendData = Encoding.Default.GetBytes(sendMsg);
            IPEndPoint targetPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 5500);
            udpClient.Send(sendData, sendData.Length, targetPoint);
            Console.WriteLine("Send Message:{0}", sendMsg);
            Console.Read();
        }
    }

static void Main(string[] args)
        {
            IPEndPoint udpPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 5500);
            UdpClient udpClient = new UdpClient(udpPoint);
            //IPEndPoint senderPoint = new IPEndPoint(IPAddress.Parse("14.55.36.2"), 0);
            IPEndPoint senderPoint = new IPEndPoint(IPAddress.Any, 0);
            byte[] recvData = udpClient.Receive(ref senderPoint);
            Console.WriteLine("Receive Message:{0}",Encoding.Default.GetString(recvData));
            Console.Read();
        }