Hi

I've recently been working on a game and i want it to be a multiplayer game. I went to my beloved book "Managed DirectX Kick start" to create a peer to peer session but it didn't work and the examples too.I use windows vista so anybody who got the examples for that book please to me if it works propper on win vista.any way i need and example for p2p session using directplay I REPEAT p2p not client /server.please help me with anything you can.

The kickstart book is one of the very few places I have ever seen any managed DirectPlay code and thats about 4 years old now. Since DirectPlay has been deprecated a long time ago you will be VERY lucky to find someone to help you or any samples. I don't know why it doesn't run on Vista - but there are some DirectX deprecated files removed in the Vista instll of DX9.

The current recommendation is to use System.Net or other libraries rather than DirectPlay. This FAQ is for XNA but its links should help you.

It is well known that all kind of firewalls don’t like DirectPlay. Therefore I would believe that the new Vista firewall is the reason.  

But as ZMan already have said: Stay away from DirectPlay as it is deprecated.