[How Do I:] Determine Whether an Asynchronous Postback has Occurred?
by Joe Stagner
The Page_Load method of an ASP.NET Web form will execute during either a standard full-page postback or an asychnronous partial-page postback. In this video we learn how we can use the ASP.NET AJAX ScriptManager to determine whether an UpdatePanel postback has occurred, which allows us to conditionally execute code.