When you use AJAX’s UpdatePanel, you may find that the controls inside of the UpdatePanel generate full postback instead of partial postback, if it occurs to you, then you may need to check your web.config file to see if there is a line like this:
<xhtmlConformance mode="Legacy" />
If yes, then that is the bad guy that causes all kinds of problems in AJAX including the issue mentioned above. Removing the line from web.config will fix the issue.
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