C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using MSWinsockLib;
using AxMSWinsockLib;
using System.Net;
using System.Net.Sockets;

namespace @as
{
    public partial class Form1 : Form
    {
        WinsockClass winSockCls;
        Object data;
        String str;

        public Form1()
        {
            InitializeComponent();

            data = new Object();

            winSockCls = new WinsockClass();
            winSockCls.Close();

            winSockCls.DataArrival += new MSWinsockLib.DMSWinsockControlEvents_DataArrivalEventHandler(Socket_DataArrival); 
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            winSockCls.Protocol = MSWinsockLib.ProtocolConstants.sckUDPProtocol;

            winSockCls.RemoteHost = "192.168.0.6";
            winSockCls.RemotePort = 12345;

            //winSockCls.Bind(8080, "192.168.0.22");
            winSockCls.LocalPort = 8080;

            str = "Hi Ani";
            winSockCls.SendData(str);
        }
        private void Socket_DataArrival(int bytesTotal)
        {
            if (winSockCls.State != (short)MSWinsockLib.StateConstants.sckOpen)
                return;

		winSockCls.GetData(ref data, data.GetType(), bytesTotal);
            winSockCls.SendData("AS");
        }
    }
}