Thanks alot Shaggy, I want to ask if I can use this class in smartdevice project ( emulator ) of VB .NET. Pardon my question because I'm very newbie using such platform

One more thing. I found chatting application written using VB .NET it consists of three parts: client, server, inbetween, so I wonder if I can use the PC as server. Pocket Pc as client, and then modify the project so I can transfer files btwn them ?