How can i bind category/sub category to frontend webpage

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ASP.NET

SQL-Server-2008

Dear All,

I am stuck with this thing, I have a front end of webpage design ready where in
I have 4 images as categories and when i click on any of the image then it should redirect
to another page with sub categories with images present.

I want to bind the code . ie when i click on the image in the webpage it should redirect to
subcategory and the data about category and subcategory should be stored and retrieved from sqlserver db.

The problem is already the front end of website is ready but how to bind category and subcategory with image fields and upon clicking category an event is raised and it should redirect to subcategory.