while (true)
             {
                 if (mySock.Accept();)
                 {

                 }

             }

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

namespace asServer
{
     class server
     {
         public static void serverStart()  
         {

             System.Console.Title = "Server";
             System.Console.ForegroundColor = ConsoleColor.Green;
             IPEndPoint fullAddress = null; /* x.x.x.x:xxxx; (IP:port)*/
             System.Console.WriteLine("Какой порт поставить в режим прослушивания?");
             System.Console.Write(">>");
             int portInUse, online;
             string pPort = System.Console.ReadLine();
             int.TryParse(pPort, out portInUse);
             System.Console.WriteLine("Сколько допускать подключений к порту " + portInUse + "?");
             System.Console.Write(">>");
             string tOnline = System.Console.ReadLine();
             int.TryParse(tOnline, out online);
             System.Console.WriteLine("Запускаем сервер...");
             Socket mySock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
             System.Console.WriteLine("port: " + portInUse);
             System.Console.WriteLine("Количество возможных подключений: " + online);
             try
             {
                 fullAddress = new IPEndPoint(IPAddress.Any, portInUse);
                 System.Console.WriteLine("Ставим порт " + portInUse + " в режим прослушивания...");
                 mySock.Bind(fullAddress);
                 mySock.Listen(online);
             }
             catch (ObjectDisposedException e)
             {
                 Console.WriteLine("We have some problems :(");
                 Console.Write("Тект ошибки: ");
                 Console.WriteLine(e.Message);
             }
             catch (SocketException e)
             {
                 Console.WriteLine("We have some problems :(");
                 Console.Write("Тект ошибки: ");
                 Console.WriteLine(e.Message);
             }
             catch (InvalidOperationException e)
             {
                 Console.WriteLine("We have some problems :(");
                 Console.Write("Тект ошибки: ");
                 Console.WriteLine(e.Message);
             }
             System.Console.WriteLine("Никаких проблем! Сервер запущен!");
             Console.WriteLine("Ждём новых соединений...");
             Socket sAccept = mySock.Accept();  
             Console.WriteLine("Есть соединение!");
      
             }
         
         public static void Main(string[] args)
         {
             serverStart();
             System.Console.ReadKey();
         }
     }
}

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

namespace asClient
{
     class asClient
     {
         public static void clientStart()
         {
             System.Console.Title = "Client";
             System.Console.ForegroundColor = ConsoleColor.Green;
             byte[] data = new byte[1024];
             int serverPort = 0;
             System.Console.WriteLine("По какому IP подключиться к серверу?");
             System.Console.Write("Ваш выбор: ");
             string serverIP = System.Console.ReadLine();
             System.Console.WriteLine("Порт сервера?");
             System.Console.Write("Ваш выбор: ");
             string sPort = System.Console.ReadLine();
             int.TryParse(sPort, out serverPort);
             System.Console.WriteLine("IP: " + serverIP);
             System.Console.WriteLine("Port: " + serverPort);
             System.Console.WriteLine("Full Address: " + serverIP + ":" + serverPort);
             System.Console.WriteLine("Подключаемся по " + serverIP + ":" + serverPort + "...");  
             IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(serverIP), serverPort);
             Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
             try
             {
                 server.Connect(ipep);
             }
             catch (SocketException e)
             {
                 Console.WriteLine("Не могу подключиться к серверу...");
                 Console.WriteLine(e.ToString());
                 return;
             }

         }
         public static void Main()
         {
             clientStart();
             System.Console.ReadKey();
         }
     }
}

public void StartAccept(SocketAsyncEventArgs acceptEventArg)
     {
         if (acceptEventArg == null)
         {
             acceptEventArg = new SocketAsyncEventArgs();
             acceptEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(AcceptEventArg_Completed);
         }
         else
         {
             // socket must be cleared since the context object is being reused
             acceptEventArg.AcceptSocket = null;
         }

         m_maxNumberAcceptedClients.WaitOne();
         bool willRaiseEvent = listenSocket.AcceptAsync(acceptEventArg);
         if (!willRaiseEvent)
         {
             ProcessAccept(acceptEventArg);
         }
     }

     // This method is the callback method associated with Socket.AcceptAsync  
     // operations and is invoked when an accept operation is complete
     //
     void AcceptEventArg_Completed(object sender, SocketAsyncEventArgs e)
     {
         ProcessAccept(e);
     }

  string mes = System.Console.ReadLine();
                 server.SendFile(mes);

int Value = 56789;

byte[] SendData = BitConverter.GetBytes(Value);
server.Send(SendData);

     try
             {
                 server.Connect(ipep);
                 string mes = System.Console.ReadLine();
                 data = Encoding.ASCII.GetBytes(mes);
                 server.SendTo(data, ipep);
             }

  try
             {
                 fullAddress = new IPEndPoint(IPAddress.Any, portInUse);
                 System.Console.WriteLine("Ставим порт " + portInUse + " в режим прослушивания...");
                 mySock.Bind(fullAddress);
                 mySock.Listen(online);
                 Socket client = mySock.Accept();
                 Console.WriteLine("Ожидание соединения… {0}", mySock.LocalEndPoint);
                 mySock.BeginAccept(new AsyncCallback(ReceiveCallback), mySock);
                 string mes = Encoding.ASCII.GetString(clientData);

                 Console.WriteLine(mes);
             }