Two Clicks Required
Sometimes, when I have an UpdatePanel and multiple validators on a page, I have to click twice on a LinkButton, even if it has CausesValidation set to false. The control is outside the UpdatePanel, so I'm not sure what causes this. It is a frequent problem, as can be seen on Google.
I am looking into it now, so far, I have a simple solution that works:
var old = Page_ValidationActive;
Page_ValidationActive = false;
Page_ValidationActive = old;
When I have more information, I will post about it. If you happen to know the problem and its solution, please drop me a line!