//這裡建立的是負責通訊的socket,這個socket 不分 伺服器或客戶端
        public  static Socket socketCommunication = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);


        public Form1()
        {
            InitializeComponent();
        }

        //開啟連結   伺服器
        private void button2_Click(object
 
 sender, EventArgs e)
        {
            IPAddress ip = IPAddress.Parse(txtServer.Text);
            IPEndPoint point = new IPEndPoint(ip, int.Parse(txtPort.Text));
            try
            {
                socketCommunication.Connect(point);
                DateTime dt = DateTime.Now;
                dt.ToUniversalTime().ToString();
                
 
this.listBox1.Items.Add(dt.ToUniversalTime().ToString() + "連結成功");
            }
            catch (Exception e1)
            {
                Console.WriteLine("Thread aborted.");
                socketCommunication.Connect(point);
                DateTime dt = DateTime.Now;
                dt.ToUniversalTime().ToString();
                
 
this.listBox1.Items.Add(dt.ToUniversalTime().ToString() + "連結失敗");
            }

        }

        //傳送資料
        private void button1_Click(object sender, EventArgs e)
        {

            //接受
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
            bytes = socketCommunication.Receive(recvBytes, recvBytes.Length, 0);
            recvStr = Encoding.UTF8.GetString(recvBytes, 0, bytes);


            //傳送
            string str = "vsvvsvd";
            //把要傳送的訊息轉為位元組陣列
            byte[] buffer = System.Text.Encoding.UTF8.GetBytes(str);
            socketCommunication.Send(buffer);
            //
            socketCommunication.Close();
        }