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Hi Friends,
I'm Creating an application using Windows Forms, In that i Kept a feature called MESSAGING by using that the application user can communicate with the person who are all in the LAN by using their IP Address. How to Make a communication Over this..?
thanks in advance..

To Make a communication in your situation you need to do socket programming. Following links will help you to develope the solution.

An Introduction to Socket Programming in .NET using C#
According to your problem, Socket Programming is the only way.
There are lot many articles in codeproject which will gives you a solution.
It can be done on one of several different levels of networking, remoting or WPF.
Please see my overview of these approaches in my past solutions:
how i can send byte[] to other pc[^],
Communication b/w two Windows applications on LAN.[^].


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