So I have a MaskedEditControl inside an UpdatePanel that throws a Sys.InvalidOperationException: Type AjaxControlToolkit.BehaviorBase has already been registered. This only happens when the user loads the page, then the application pool gets recycled or iisreset is issued, then the user clicks a button to trigger partial update for the UpdatePanel that MaskedEditControl is in. Anyone got any ideas?
Regards,
Duwayne