Exception Udp Client : Udp Client : Network C# Source Code

    

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/

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

public class ExceptionUdpClient
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string input, stringData;
      int recv;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Dgram, ProtocolType.Udp);

      int sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
      Console.WriteLine("Default timeout: {0}", sockopt);
      server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
      sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
      Console.WriteLine("New timeout: {0}", sockopt);

      string welcome = "Hello, are you there?";
      data = Encoding.ASCII.GetBytes(welcome);
      server.SendTo(data, data.Length, SocketFlags.None, ipep);

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
      EndPoint Remote = (EndPoint)sender;

      data = new byte[1024];
      try
      {
         recv = server.ReceiveFrom(data, ref Remote);
         Console.WriteLine("Message received from {0}:", Remote.ToString());
         Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
      } catch (SocketException)
      {
         Console.WriteLine("Problem communicating with remote server");
         return;
      }

      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         server.SendTo(Encoding.ASCII.GetBytes(input), ipep);
         data = new byte[1024];
         try
         {
            recv = server.ReceiveFrom(data, ref Remote);
            stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine(stringData);
         } catch (SocketException)
         {
            Console.WriteLine("Error receiving message");
         }
      }
      Console.WriteLine("Stopping client");
      server.Close();
   }
}