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I have a simple page with my ScriptManager and my UpdatePanel, and my ContentTemplate has one ListBox and one Label. I am just trying to catch its OnSelectionChanged so I can update the text in the Label. No matter what settings I try to tweak, I always get a full-page postback.
Is this really not going to work, or am I just screwing this up?
You need to have Sharepoint 2007 service pack 1 — or else there’s no chance. (Sharepoint 2007 predates ajax 1.0 — they built some support into service pack 1)
Next, from a trouble shooting point of view, test that the exact same code functions as expected when hosted in a regular asp.net page. (Literally copy and paste your code across into a fresh page, to rule out any typographical errors). Ruling sharepoint in or out of the problem area will help narrow down the solution space.