File: UdpClient.cs

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

namespace UdpClient
{
    class UdpClient
    {
        static void Main(string[] args)
        {

            IPAddress destIp = IPAddress.Parse("192.168.198.130");

            IPEndPoint destEndpoint = new IPEndPoint(destIp, 5001);
            string text =
                "blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah" +
                "blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah" +
                "blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah" +
                "blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah";

            Console.WriteLine("Started Client...");
            while (true)
            {

                byte[] sendBuffer = Encoding.ASCII.GetBytes(text);
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                try
                {
                    socket.SendTo(sendBuffer, destEndpoint);

                    socket.ReceiveTimeout = 3000;
                    byte[] receiveBuffer = new byte[sendBuffer.Length];
                    socket.Receive(receiveBuffer);

                    socket.Close();


                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }
}


File: UdpServer.cs

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


namespace UdpServer
{
    internal class UdpServer
    {
        private static void Main(string[] args)
        {
            const int listenPort = 5001;
            UdpClient listener = new UdpClient(listenPort);
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, listenPort);
            byte[] buffer;

            Console.WriteLine("Started server...");
            try
            {
                while (true)
                {
                    buffer = listener.Receive(ref endPoint);
                    Console.WriteLine("Got session from: {0}", endPoint);

                    listener.Send(buffer, buffer.Length, endPoint);

                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
            listener.Close();
        }
    }
}