SynchronousSocketServer.cs

IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);
int bufferSize = 1024 * 2;

// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );

try 
{
  listener.Bind(localEndPoint);
  listener.Listen(10);

  // Start listening for connections.
  while (true) 
  {
    Socket client = listener.Accept();
    byte[] packageSizeBuffer = new byte[sizeof(int)]; // buffer for integer
    int position = socket.Receive(packageSizeBuffer); // read request size

    int requestSize = BitConverter.ToInt32(packageSizeBuffer, 0);

    byte[] request;
    using (MemoryStream ms = new MemoryStream())
    {
      ms.Write(packageSizeBuffer, 0, position);
      position = 0;
      while (position != requestSize)
      {
        byte[] package = new byte[bufferSize];
        int received = socket.Receive(package);
        ms.Write(package, 0, received);
        position += received;
      }

      request = ms.ToArray();
    }
    ProcessClientRequest(request);
  }
}