To have bonus mark in my project i would like to register my application...
I want a msgbox to appear after i login which tell him/her that "this application is not registered"..
i want to put a counter which after 5 mins a msg box will appear which he/she must register the application..

Any1 know how to do this ..

To do this, you can create a flag key in registry. It will store bit value. You can read from the registry and flip the bit value.

Simple method will be to create a check sum funtion and pass a value. This funtion will take this user input key which will be the registration code. And the code will workout a check sum. If your check sum and the user key check sum matches, you can flip the flag key to registered.