Advantages and disadvantages of usercontrol in asp.net

Question

Can some one please tell me if I should use user controls in my project as much as I can? Ff so why and if not why not?

Answer 1

User controls are good for the same reasons that subroutines/functions/methods are good: code (and markup) re-use.

Like subroutines, controls can be a problem if they do things like modify global state, make lots of DB or other off-box calls that aren't always needed, introduce unavoidable synchronous blocking, etc. They can also add an unnecessary layer of complexity if they are never re-used.