What is the difference between AsyncPostBackTrigger & PostBackTrigger?

Question

What is the difference between AsyncPostBackTrigger & PostBackTrigger?

Answer 1

Suppose Button1 is inside your Update panel and Button2 is outside the update panel. Now let's undertsand that the controls that are outside the update panel are doing a Asyncpostback and that are inside creates a Syncpostback.

So as both buttons are on a form Button1 in inside Update panel and bUtton2 is outside it. So by the way by giving the Button2's ID and its Event name to the Asyncpostback Trigger as given in the example we suppose that now it will create a syncpostback with the updatepanel as like the Button1.