Dynamically changing controls... a bad idea?

[margaret_alice]

Hello,

I have a general design question about asp.net. Consider a webform
which is to switch between a view mode and an edit mode. I convenient
design pattern, in my opinion, is to have different controls for both
the view and edit modes. Thus, by default LoadControl is used to load
the VIEW control and when some button is clicked, the EDIT control will
be loaded.

My first question is: "If the button click is recognized only after the
INIT and LOAD, how can one decide which control to load (without
refreshing the page or using something in the query string)?"

If the answer is to simply put all the controls on the page and make
the current once visible and the others not visible, then another
question is "Isn't this terribly inefficient?"

Thanks so much for your thoughts,
Margy