using System; using System.Net; using System.Net.Sockets; using System.Text; public class MultiSend { public static void Main() { Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint iep = new IPEndPoint(IPAddress.Parse("224.100.0.1"), 9050); byte[] data = Encoding.ASCII.GetBytes("This is a test message"); server.SendTo(data, iep); server.Close(); } }