Here Mudassar Ahmed Khan has explained with an example, how to use SelectedIndexChanged event of DropDownList placed inside AJAX UpdatePanel in ASP.Net using C# and VB.Net.
The AsyncPostBackTrigger needs to be specified in the AJAX UpdatePanel in order to fire the SelectedIndexChanged event of the DropDownList using Partial PostBack.
The SelectedIndexChanged event will work / fire / trigger only when the AutoPostBack property of the ASP.Net DropDownList is set to True.
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