Step by step in creating a Windows chat application using visual studio 2008 C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
namespace New_Team_project
{
public partial class Form1 : Form
{
Socket sck;
EndPoint eplocal, epRemote;
public Form1()
{
InitializeComponent();
sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
textlocalip.Text = GetLocalIP();
textfriendsip.Text = GetLocalIP();
}
private string GetLocalIP()

{

IPHostEntry host;

host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)

{

if (ip.AddressFamily == AddressFamily.InterNetwork)

{

return ip.ToString();

}

}

return "127.0.0.1";

}
private void Messagecallback(IAsyncResult aResult)
{

try

{

int size = sck.EndReceiveFrom(aResult, ref epRemote);
if (size > 0)
{
byte[] receivedData = new byte[1464];
receivedData = (byte[])aResult.AsyncState;
ASCIIEncoding eEncoding = new ASCIIEncoding();

string receivedMessage = eEncoding.GetString(receivedData);
listMessage.Items.Add("Friend: " + receivedMessage);
}
byte[] buffer = new byte[1500];
sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(Messagecallback), buffer);

}

catch (Exception exp)

{

MessageBox.Show(exp.ToString());

}

}

private void button1_Click(object sender, EventArgs e)
{
try

{

eplocal = new IPEndPoint(IPAddress.Parse(textlocalip.Text), Convert.ToInt32(textlocalport.Text));
sck.Bind(eplocal);

eplocal = new IPEndPoint(IPAddress.Parse(textfriendsip.Text), Convert.ToInt32(textfriendsport.Text));
sck.Connect(epRemote);
byte[] buffer = new byte[1500];
sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(Messagecallback), buffer);



button1.Text = "connected";
button1.Enabled = false;
button2.Enabled = true;
textMessage.Focus();

}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void button2_Click(object sender, EventArgs e)
{
try
{
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
byte[] msg = new byte[1500];
msg = enc.GetBytes(textMessage.Text);
sck.Send(msg);
listMessage.Items.Add("You:"+textMessage.Text);
textMessage.Clear();


}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
}
}