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In ASP .Net a dropdownList which AutoPostback property is true inside an Update panel control always refresh the whole page. If select a dropdown item then full page refreshes and page fluctuate. How can I prevent this.
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you need to remove auto post back and set asp:AsyncPostBackTrigger for your drop down list
http://stackoverflow.com/questions/2138565/drop-down-list-in-update-panel-causing-full-postback[^]
   

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