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

namespace Server
{
class Server
{
 private static void OnBeginAccept(IAsyncResult ar)
 {
  try
  {
   Socket listener =(Socket)ar.AsyncState;
   using(Socket client=listener.EndAccept(ar))
   {
    byte[] buffer=new byte[100];
    client.Receive(buffer);
    buffer=Encoding.UTF8.GetBytes(string.Format("Hello,{0}", Encoding.UTF8.GetString(buffer)));
    client.Send(buffer);
   }
  }
  catch (Exception ex)
  {
   Console.WriteLine("ОШИБКА!!! "+ex.Message);
  }
 }
 
 
 [STAThread]
 static void Main(string[] args)
 {
  try
  {
   
   EndPoint endPoint=new IPEndPoint(IPAddress.Loopback,8000);
   using (Socket listener=new Socket(endPoint.AddressFamily,SocketType.Stream,ProtocolType.Tcp))
   using (Socket client=new Socket(endPoint.AddressFamily,SocketType.Stream,ProtocolType.Tcp))
   {
     listener.Bind(endPoint);
     listener.Listen(1);
     listener.BeginAccept(new AsyncCallback(OnBeginAccept),listener);

     Console.WriteLine("Enter command");
     string request=Console.ReadLine();
     client.Connect(endPoint);
     int count=client.Send(Encoding.UTF8.GetBytes(request));
     byte[] buffer=new byte[100];
     client.Receive(buffer);
     string responce=Encoding.UTF8.GetString(buffer);
     int index=responce.IndexOf('\0');
     Console.WriteLine(string.Format("Answer: {0}",responce.Remove(index,1)));

   }
   Console.WriteLine("Сервер запущен!!!");
   Console.ReadLine();

   
  }
  catch(Exception ex)
  {
   Console.WriteLine("ERROR!!! "+ex.Message);
  }
 }
}
}