Updatepanel gives full postback instead of asyncpostback

Question

I have run into what seems to be a very famous problem: My updatepanel fires a full postback instead of a async postback. The normal solution is to give all controls you add

Answer 1

From the AsyncPostBackTrigger documentation:

Programmatically adding AsyncPostBackTrigger controls is not supported. To programmatically register a postback control, use the RegisterAsyncPostBackControl method of the ScriptManager control. Then call the Update method of the UpdatePanel control when the control posts back.

Answer 2

I had the same experience when populating a CheckBoxList inside a ListView inside a Panel in an UpdatePanel. It was solved by adding this code in the CheckBoxList:

ClientIDMode="AutoID"