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

public class TimeServer {
  private Socket s;

  public TimeServer() {}

  public bool StartUp(IPAddress ip, int port) {
    try {
      s = new Socket(  AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      s.Bind(new IPEndPoint(ip, port));
      s.Listen(10); 
    } catch (Exception e) {
      Console.WriteLine(e.Message);
      return false;
    }
    for(;;) {
      Socket newSocket = s.Accept(); // blocks until a client connects
      Communicate(newSocket);
    }
  }
  void Communicate(Socket clSock) {
    try {
      byte[] b = Encoding.ASCII.GetBytes(DateTime.Now.ToString());
      clSock.Send(b);
      clSock.Shutdown(SocketShutdown.Both);
      clSock.Close ();
    } catch (Exception e) {
      Console.WriteLine(e.Message);
    }
  }
}

public class Chap4_Ex15_Test {
  public static void Main(string[] args) {
    TimeServer server = new TimeServer();
    if (! server.StartUp(IPAddress.Loopback, 50000))
      Console.WriteLine("Starting time server failed");
  }
}