?using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace MyListenerPocket
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      bool done = false;

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

      try
      {
        textBox1.Text += string.Format("Waiting for broadcast");
        byte[] bytes = listener.Receive(ref groupEP);

        textBox1.Text += string.Format("Received broadcast from {0} :\n {1}\n",
            groupEP.ToString(),
            Encoding.ASCII.GetString(bytes, 0, bytes.Length));

      }
      catch (Exception ex)
      {
        textBox1.Text += string.Format(ex.ToString());
      }
      finally
      {
        listener.Close();
      }
    }
  }
}