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

namespace UdpSendConsole
{
  class Program
  {
    static void Main(string[] args)
    {
      IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("192.168.10.10"), 9000);
      Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
      while (true)
      {
        try
        {
          string text = "Hello at " + DateTime.Now.ToLongTimeString();
          byte[] buf  = Encoding.ASCII.GetBytes(text );
          sock.SendTo(buf, endPoint);
          System.Threading.Thread.Sleep(100);
        }
        catch (Exception ex)
        {
          Console.Write( "Exception: " + ex.Message );
        }
      }
    }
  }
}

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

namespace UdpListenerConsole
{
  class Program
  {
    static void Main(string[] args)
    {
      UdpClient listener = new UdpClient(11000);

      IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 11000);

      string received_data;
      byte[] receive_byte_array;

      try
      {
        while(true)
        {
          receive_byte_array = listener.Receive(ref groupEP);

          Console.WriteLine("Received a broadcast from {0}", groupEP.ToString());
          received_data = Encoding.ASCII.GetString(receive_byte_array, 0, receive_byte_array.Length);
          Console.WriteLine("data follows \n{0}\n\n", received_data);
        }
      }
      catch (Exception ex)
      {
        Console.Write("Exception: " + ex.Message );
      }
    }
  }
}

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

namespace UdpSendConsole
{
  class Program
  {
    static void Main(string[] args)
    {
      int tCnt = 0;
      while (true)
      {
        try
        {
          string text = "Hello at " + DateTime.Now.ToLongTimeString();
          byte[] buf = Encoding.ASCII.GetBytes(text);

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

          IPAddress send_to_address = IPAddress.Parse("192.168.10.10");
          IPEndPoint sending_end_point = new IPEndPoint(send_to_address, 11000);

          sending_socket.SendTo(buf, sending_end_point);


          Console.Write(tCnt++.ToString() + " ");
          //sock.SendTo(buf, endPoint);
          System.Threading.Thread.Sleep(100);
        }
        catch (Exception ex)
        {
          Console.Write( "Exception: " + ex.Message );
        }
      }
    }
  }
}