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Udp Multi receive

using System; using System.Net; using System.Net.Sockets; using System.Text; class MainClass {    public static void Main()    {       Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);       Console.WriteLine("Ready to receive...");       IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9999);       EndPoint ep = (EndPoint)iep;       sock.Bind(iep);       sock.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,new MulticastOption(IPAddress.Parse("127.0.0.1")));       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());       sock.Close();    } }