Hi alialibidad,
The chapter Customer Support Site of my latest book
ASP.NET 2.0 Instant Results deals with linked drop-downs, allowing you to drill down to a specific category. The code uses DropDownList controls and ObjectDataSource controls that ultimately get their data from a SQL Server database.
Obviously, buying an entire book for a single topic may be a bit too much, but the book contains a whole lot of other interesting stuff.
Imar
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Imar Spaanjaars
Everyone is unique, except for me.
Author of
ASP.NET 2.0 Instant Results and
Beginning Dreamweaver MX / MX 2004