vb coding on database

Buy a book, or learn to use google. This is too broad a subject to answer, especially as you can't use the tag system properly, you did not tag your question as VB, let alone tell us what database you meant. The code will also not be specific to Windows 7. In short, we have every reason to believe that you have no idea what you're doing, and should consider working through a beginners book before asking us questions that are impossible to answer, when the odds are good you'll not understand the answer anyhow.