Csharp/C Sharp/Network/Broadcast

Bad Broadcast

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class BadBroadcast {
   public static void Main()
   {
      Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
      IPEndPoint iep = new IPEndPoint(IPAddress.Broadcast, 9050);
      byte[] data = Encoding.ASCII.GetBytes("This is a test message");
      sock.SendTo(data, iep);
      sock.Close();
   }
}

Broadcst Sample

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class Broadcst
{
   public static void Main()
   {
      Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
      IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 9050);
      IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.1.255"), 9050);
      string hostname = Dns.GetHostName();
      byte[] data = Encoding.ASCII.GetBytes(hostname);
      sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
      sock.SendTo(data, iep1);
      sock.SendTo(data, iep2);
      sock.Close();
   }
}

Receive Broadcast

/*
C# Network Programming 
by Richard Blum
Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class RecvBroadcst
{
   public static void Main()
   {
      Socket sock = new Socket(AddressFamily.InterNetwork,
                      SocketType.Dgram, ProtocolType.Udp);
      IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);
      sock.Bind(iep);
      EndPoint ep = (EndPoint)iep;
      Console.WriteLine("Ready to receive...");
      byte[] data = new byte[1024];
      int recv = sock.ReceiveFrom(data, ref ep);
      string stringData = Encoding.ASCII.GetString(data, 0, recv);
      Console.WriteLine("received: {0}  from: {1}",
                            stringData, ep.ToString());
      data = new byte[1024];
      recv = sock.ReceiveFrom(data, ref ep);
      stringData = Encoding.ASCII.GetString(data, 0, recv);
      Console.WriteLine("received: {0}  from: {1}",
                            stringData, ep.ToString());
      sock.Close();
   }
}