C# Server Socket

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using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;using LitJson;public class Program{    static Socket serverSocket;    static Socket listenScoket;    static int byt;    static byte[] buf;    static byte[] bufsend;    static string str;    static Thread threadSend, threadRec;    public static void Main (string[] args){        serverSocket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);        IPEndPoint ipEndpoint = new IPEndPoint (IPAddress.Parse ("127.0.0.1"), 3333);        serverSocket.Bind (ipEndpoint);        serverSocket.Listen (20);        buf = new byte[1024];        bufsend = new byte[1024];        listenScoket = serverSocket.Accept ();        if (listenScoket.Connected) {//            threadRec = new Thread (new ThreadStart(ReceiveSocket));//            threadRec.IsBackground = true;//            threadRec.Start ();            threadSend = new Thread (new ThreadStart (SendSocket));            threadSend.IsBackground = true;            threadSend.Start ();        } else {            Console.WriteLine ("fail");        }                        Console.ReadKey ();    }    public static void SendSocket(){        while (true) {//            string userid = Console.ReadLine ();//            string state = Console.ReadLine ();//            string sends = "{\"userid\":\"" + userid + "\",\"state\":\"" + state + "\"}";            string sends = "{\"server\":\"00\"}";            bufsend = Encoding.UTF8.GetBytes (sends);            listenScoket.Send (bufsend);        }    }            public static void ReceiveSocket(){        while(true){            byt = listenScoket.Receive(buf);            if(byt>0){                str = Encoding.UTF8.GetString(buf);                Console.WriteLine(str);                bufsend = Encoding.UTF8.GetBytes ("{\"userid\":\"id123\",\"state\":\"03\"}");                listenScoket.Send (bufsend);            }        }    }}

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C# Server Socket