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How can I tell if a method is running in the context of an AJAX postback (i.e as the result of a UpdatePanel (asynchronous) postback)?
According to egoldin Page.IsAsync is a very common confusion that has absolutely nothing to do with AJAX.
The correct approach is to use ScriptManager.GetCurrent ( Page ).IsInAsyncPostBack.
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<asp:AsyncPostBackTrigger> Specifies a control and event that will cause a partial page update for the UpdatePanel that contains this trigger reference. <asp:PostBackTrigger> Specifies a control and event that will cause a full page update (a full page refresh).
UpdatePanel controls are a central part of AJAX functionality in ASP.NET. They are used with the ScriptManager control to enable partial-page rendering. Partial-page rendering reduces the need for synchronous postbacks and complete page updates when only part of the page has to be updated.
Converts postbacks into async callbacks Typically used to trigger updates when controls outside an UpdatePanel post back If ChildrenAsTriggers="false", can be used to specify which controls inside UpdatePanel should call back rather than post back.
Add AsyncPostBackTrigger controls either by using the UpdatePanelTrigger Collection Editor dialog box in the designer or by creating a Triggers element declaratively in the UpdatePanel control. The ControlID property is required, but the EventName property is optional.
Use ScriptManager.GetCurrent ( Page ).IsInAsyncPostBack
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