客户端

static void Main(string[] args)        {            Console.WriteLine("this is a Client!");            Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            client.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8000));                       while (true)            {                string sendmsg = Console.ReadLine();                client.Send(System.Text.Encoding.Default.GetBytes(sendmsg));                Console.WriteLine(sendmsg + " is send Ok!");            }

服务器

static void Main(string[] args)        {            Console.WriteLine("this is a Server!");            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            server.Bind(new IPEndPoint(IPAddress.Any, 8000));            server.Listen(50);            server.BeginAccept(Callback, server);            Console.ReadLine();        }        static void Callback(IAsyncResult ar)        {            Socket server = (Socket)ar.AsyncState;            Socket client = server.EndAccept(ar);                     while (true)            {                byte[] buffer = new byte[100];                client.Receive(buffer,0,buffer.Length,SocketFlags.None);                Console.WriteLine(System.Text.Encoding.Default.GetString(buffer).Trim());            }        }