Trigger an update of the UpdatePanel by a control that is in different ContentPlaceHolder

Question

I have a page with two ContentPlaceHolders. One has a DropDown and another UpdatePanel with content.

How can I trigger update to the UpdatePanel by the DropDown\'s

Answer 1

In the code-behind file, you should be able to do:

ScriptManager.RegisterAsyncPostBackControl(dropdown1);