I have a gadmei pt228f tv card plugged in to my pc.i need to write a c# application in order to display tv in my application.can someone give me a idea to start with
Take a look at the MediaPortal project. It got support for lots of different TV cards (and it's written in C#)
http://wiki.team-mediaportal.com/1_MEDIAPORTAL_1/18_Contribute/4_Development/Subversion_%28SVN%29