Implementation of C# Socket communication (simultaneous listening to multiple clients)

 //Create socket object            //The first parameter: set the network addressing protocol, the second parameter sets the data transmission method, and the third parameter sets the communication protocol.            Socket serverSocket = new Socket(, , );
            //2. Bind IP port            string str = "127.0.0.1";
            int ports = 55555;
            IPAddress ip = (str);
            IPEndPoint ipENdpoint = new IPEndPoint(ip, ports);
 
            (ipENdpoint);
            //3. Turn on monitoring            (10);
            label5_Timer.Text = "Start listening...";
 
            //4. Start accepting client links            (new WaitCallback(), serverSocket); 
        }
        public void StartAcceptClient(object state)
        {
            var serverSocket = (Socket)state;
            ("The server starts accepting links from the client");
            while (true)
            {
                try
                {
                    Socket prosock = ();
                    //Save the IP address and socket of the remote linked client into the collection                    ((), prosock);
                    string ipPort = ();
                    MedicineDevice ns = new MedicineDevice();
                    SQLMachine j = new SQLMachine();                   
 
                    (ipPort, "Online");
                    // Link object information                    string stinfo = ();
                    (("Client{0}Linked on", stinfo));
 
                    (prosock);
                    //The server receives the client's message                    (new WaitCallback(), prosock);
                }
                catch (Exception e)
                {
                    return;
                    //throw;
                } 
            }

 public void ReceiveData(object obj)
        {
            var prosock = (Socket)obj;
            byte[] data = new byte[1024 * 1024];
            //Method returns the length of the data actually accepted            while (true)
            {
                int realen = 0;
                try
                {
                    realen = (data, 0, , );
                }
                catch (Exception e)
                {
                    //quit unexpectedly                    AppendTextLog(("equipment {0} quit unexpectedly", ()));                  
                    StopCOnnecte(prosock);
                    return;
                }
                if (realen <= 0)
                {
                    //The other party exits normally 
                    AppendTextLog(("equipment {0} Exit normally：", ()));             
                    }
                    ();
                    ();
                    (prosock);
                    return;
                }
                // Accepted data                string fromClientMsg = (data, 0, realen);
                AppendTextLog(("Received {0} The news is：{1}", (), fromClientMsg));}}
  private void StopCOnnecte(Socket prosock)
        {
            try
            {
                if ()
                {
                    ();
                    (100);
                }
            }
            catch (Exception ex)
            { 
            }
        }
 public void AppendTextLog(string txt)
        {
            if (textBox_Message.InvokeRequired)
            {
                textBox_Message.BeginInvoke(new Action<string>(s =>
                {
                    this.textBox_Message.Text = ("{0}\r\n{1}", s, textBox_Message.Text);
                }
                    ), txt);
                //Synchronous method                //textBox_Message.Invoke(new Action<string>(s =>
                //    {
                //        this.textBox_Message.Text = ("{0}\r\n{1}", s, textBox_Message.Text);
                //    }
                //    ), txt);
            }
            else
            {
                this.textBox_Message.Text = ("{0}\r\n{1}", txt, textBox_Message.Text);
            }
        }
//There may be missed when pasting the code'{'or'}'

 _serverSocket.Listen(10);
  public void Listen(int backlog);