I came across a postback issue while using the CascadingDropDown AJAX control. I had a web page with 3 DropDownList controls. The data for these controls was populated from the CascadingDropDown which would bind the data at runtime. The issue with this
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Read the complete post at http://feeds.feedburner.com/~r/JasonNGaylord/~3/362121588/known-postback-issue-with-ajax-controls.aspx