Used by the pageLoaded event of the Sys.WebForms.PageRequestManager class to send event data that represents the UpdatePanel controls that were updated and created in the most recent postback.
var args = new Sys.WebForms.PageLoadedEventArgs();
This class contains private members that support the client-script infrastructure and are not intended to be used directly from your code. Names of private members begin with an underscore ( _ ).
The UpdatePanel control renders HTML <div> elements. The pageLoaded event contains information about which <div> elements on the page were updated and created. The panelsCreated property is an array of panel elements that were created as a result of the current asynchronous postback. The panelsUpdated property is an array of panels that were updated as a result of the current asynchronous postback.
The following example shows how to use the pageLoaded event to provide script that animates a region of the page during a partial-page update. The event data (args) is a PageLoadedEventArgs object.