Use UdpClient : UdpClient : Network C# Examples

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

class  MainClass
{
      public  static  void  Main()
      {
            byte[]  data  =  new  byte[1024];
            string  input,  stringData;
            UdpClient  udpClient  =  new  UdpClient("127.0.0.1",  9999);

            IPEndPoint  sender  =  new  IPEndPoint(IPAddress.Any,  0);

            string  welcome  =  "Hello";
            data  =  Encoding.ASCII.GetBytes(welcome);
            udpClient.Send(data,  data.Length);

            data  =  udpClient.Receive(ref  sender);

            Console.WriteLine("Message  received  from  {0}:",  sender.ToString());
            stringData  =  Encoding.ASCII.GetString(data,  0,  data.Length);
            Console.WriteLine(stringData);

            while(true)
            {
                  input  =  Console.ReadLine();
                  udpClient.Send(Encoding.ASCII.GetBytes(input),  input.Length);
                  data  =  udpClient.Receive(ref  sender);
                  stringData  =  Encoding.ASCII.GetString(data,  0,  data.Length);
                  Console.WriteLine(stringData);
            }
            udpClient.Close();
      }
}