Network is unreachable

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ConsoleApplication3
{
    public static class Data
    {
        public const int RCV_TIMEOUT = 1000;
        public const int MaxRetry = 2;      
        public const string BroadCastIP = "255.255.255.255";
        public const int UDPPort = 8080;
       
    }

    class Program
    {
        enum Response
        {
            Error, NotFound, Found
        }
     
        static void Main(string[] args)
        {
            while (true)
            {
                
				Thread.Sleep(1000);
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
                socket.EnableBroadcast = true;
                socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, Data.RCV_TIMEOUT);
                IPEndPoint ipendpoint = new IPEndPoint(System.Net.IPAddress.Parse(Data.BroadCastIP), Data.UDPPort);

                byte[] message = Encoding.ASCII.GetBytes("#Where are you");
                SendSearchMessage(socket, message, ipendpoint);
                socket.Close();

          
        	}
        }


        private static void SendSearchMessage(Socket socket, byte[] message, EndPoint rmtdevice)
        {
          
            DateTime dtStart = DateTime.Now;


            try
            {
                socket.EnableBroadcast = true;
                socket.SendTo(message, message.Length, SocketFlags.None, rmtdevice);
                Console.WriteLine("Send.");

               
            }
            catch (Exception ex)
            { Console.WriteLine(ex.Message); }
            

        }
       
    }
}