You must try, and if you have difficulties just send a message

in order to help you to make the first step
focus on those objects

Socket , TcpClient, TcpListener, NetworkStream
these are main tool to cook a good based chat application you can get help...

you have to use the DataAdapter.Update(DataSet) to commit changement in the database

Take a look at http://www.startvbdotnet.com/

to do such thinks you must use sockets

try this

Imports System
Imports System.Net.Sockets
Imports System.IO
Public Class ServerSocket1
Public Shared Sub Main()
Try

You must use dataAdapter.Update(DataSet) method to commit changes i,to data set otherwise the modification resides only in the dataset and no to be transfered to the data base