problems in a client server application(проблемы в клиент серверном приложении)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace kur_AIS_OOP_35
{
   public class SocketClient 
    {
        public static Boolean bSendMesg = true;
        public static Boolean bReadMesg = true;
        public static Boolean bExitProg = false;
        public static String ReadDATA = "000";
        public static String WriteDATA = "Вас приветствует клиент";

        IPHostEntry ipHost;
        IPAddress ipAddr;
        IPEndPoint ipEndPoint;
        Socket sender;
        string data = null;
       
        public SocketClient()
        {
            ipHost = Dns.Resolve("127.0.0.1");
            ipAddr = ipHost.AddressList[0];
            ipEndPoint = new IPEndPoint(ipAddr, 11000);
            
        }


        public static void ActionReadDATA(String data)
        {
            lock (ReadDATA)
            {
                ReadDATA = data;
            }
        }

        public void PostDataToClient()
        {
            
                byte[] msg = Encoding.UTF8.GetBytes(WriteDATA + "<theend>");
                int bytesSent = sender.Send(msg);
                bSendMesg = false;
            
        }

        public void GetDataToClient()
        {
            
            
            while (true)
            {
                //PostDataToClient();
                byte[] bytes = new byte[1024];

                int bytesRec = sender.Receive(bytes);
                if (bytesRec > 0)
                {
                    data += Encoding.UTF8.GetString(bytes, 0, bytesRec);
                }
                else
                {
                    bReadMesg = false;
                    break;
                }
                //if (data.Length < iWTF) { bReadMesg = false; break; }
                if (data.IndexOf("<theend>") > -1) //конец сообщения
                {
                    bReadMesg = false;
                    break;
                }

                if (data.IndexOf("<theendsocket>") > -1) //конец соеденения
                {
                    bExitProg = true;
                    bReadMesg = false;
                    break;
                }
               
            }
            ActionReadDATA(data);
            data = "";
        }

        public void Client() 
        {
           
         while(true)
         {
             try
             {

                 sender = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                 sender.Connect(ipEndPoint);

                 ActionReadDATA("Сокет присоеденился к " + sender.RemoteEndPoint.ToString());
                 bReadMesg = false;

                 while (!bExitProg)//цикл для приема и передачи сообщений
                 {


                     if (bSendMesg)//посылаем
                     {

                         PostDataToClient();
                     }

                     if (bReadMesg)//принимаем
                     {
                         GetDataToClient();
                         

                     }

                 }
                 sender.Shutdown(SocketShutdown.Both);
                 sender.Close();
             }
             catch (Exception e)
             {
                 //  ActionReadDATA("Exception: " + e.ToString());
                 // bReadMesg = false; 
             }
             finally
             {
                 if (sender.Connected)
                 {
                     sender.Shutdown(SocketShutdown.Both);
                     sender.Close();
                 }
             }
         }
         } 
       } 

}
</theendsocket></theend></theend>