I have a question that seems like it should have a simple answer, but
I can't seem to find it by searching...

Anyway, I'm trying to capture the IsPostBack event when I select an
item within an UpdatePanel.  I don't want items running during
postback (list, grid population, etc) events - pretty standard: If
IsPostBack Then Exit Sub

But, since AJAX doesn't technically postback (?), the IsPostBack is
coming back false...

So, how can I capture the Async postback done by AJAX?  Is there any
IsAsyncPostBack keyword and what library is it in?

Page load process:
1. Load drop down menus
2. Load data grids

"Postback process"
1. Select datagrid row
2. Populate several fields below with further information

When I select the datagrid row, IsPostBack remains false.  I've tried
splitting into multiple update panels but now they are all in a
singular panel.

TIA for the help!