static private void Server() {
 var listener = new TcpListener(IPAddress.Any, 9413);
 listener.Start();
 var client = listener.AcceptSocket();

 byte[] image = new byte[MaxImageSize];
 int realSize = client.Receive(image, image.Length, SocketFlags.None);
 File.WriteAllBytes("server.jpg", image.Take(realSize).ToArray());

 listener.Stop();
 client.Dispose();
}

static private void Client() {
 Thread.Sleep(2000); // Подождем инициализации сервера

 var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 socket.Connect(IPAddress.Loopback, 9413);

 byte[] image = File.ReadAllBytes("client.jpg");
 if (image.Length > MaxImageSize) {
  Console.WriteLine("Картинки больше чем можно");
 } else {
  socket.Send(image);
 }

 socket.Disconnect(false);
 socket.Dispose();
}