What is the difference between AsyncPostBackTrigger & PostBackTrigger?

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Controls inside an UpdatePanel by default cause a partial page update, controls outside cause a postback, using these triggers it is possible to change this behaviour as required.

From http://seminaarit.codezone.fi/video/devdays-2007/track1/2/2-ASP-dotNET_AJAX_Extensions.ppt: (dead link)

AsyncPostBackTrigger

  • 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

PostBackTrigger

  • Lets controls inside UpdatePanel post back. * Typically used to
    allow certain controls to post back when ChildrenAsTriggers=”true”

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