I have a page create-quote.aspx. I want to open this page in different modes, depending on whether a querystring parameter is present or not.
My question is at which event should I check, If I have a querystring parameter or not.
I think, it should be preinit, what do you say.
Probably the best choice is to handle them on Page_Load event:
http://msdn.microsoft.com/en-us/library/ms178472.aspx#lifecycle_events