Need Help

I have inbuilt SQL server express database with VS 2005. I can able to create the databases but i don't know how to use those databases in my application.

That's a pretty big question without some context!

Let's start out with some basics:

SQL Express learning videos: http://msdn.microsoft.com/vstudio/express/sql/learning/default.aspx VS 2005 training for database usage: http://msdn.microsoft.com/vstudio/express/beginner/windows/tier3/