I’ve seen that most of people put their user control declaration in individual aspx page, and they declare it on the top of that page. What will happen if you are going to use it on multiple number of pages and i believe most of you would like to have a kind of tag that you can simply use on your web page to add your user control. In here, we declare all the user controls in web.config which I believe is more clean and manageable.
Web.Config
How to use it in ASPX Page
Untitled Page
Fransiscus Setiawan 