MSDN Winsock TCP/IP

參考引用來源
-----
Server端：

    class ServerReceive
    {
        static void Main(string[] args)
        {
            IPHostEntry hostEntry = Dns.GetHostEntry(Dns.GetHostName());
            IPEndPoint endPoint = new IPEndPoint(hostEntry.AddressList[0], 8000);

            Socket s = new Socket(endPoint.Address.AddressFamily,
                SocketType.Dgram,
                ProtocolType.Udp);

            // Creates an IPEndPoint to capture the identity of the sending host.
            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint senderRemote = (EndPoint)sender;

            // Binding is required with ReceiveFrom calls.
            s.Bind(endPoint);

            byte[] msg = new Byte[20]; // Buffer
            Console.WriteLine("Waiting to receive datagrams from client...");

            while(Console.KeyAvailable == false)
            {
                // This call blocks.
                s.Receive(msg);
                //s.ReceiveFrom(msg, ref senderRemote);
                Console.WriteLine("\n接收到的字串： " + Encoding.ASCII.GetString(msg));
            }
            s.Close();
        }
    }

Client端：

    class ClientSend
    {
        static void Main(string[] args)
        {
            IPHostEntry hostEntry = Dns.GetHostEntry(Dns.GetHostName());
            IPEndPoint endPoint = new IPEndPoint(hostEntry.AddressList[0], 8000);
            Socket s = new Socket(endPoint.Address.AddressFamily,
                SocketType.Dgram,
                ProtocolType.Udp);

            byte[] msg = Encoding.ASCII.GetBytes("This is a test");
            Console.WriteLine("Sending data.");
            // This call blocks.
            s.SendTo(msg, endPoint);
            s.Close();
        }
    }