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ASP.NET Page Loading events before and after post-back


Posted Date: 31 Jul 2008    Resource Type: Tips    Category: Web Development
Posted By: Balamurali Balaji       Member Level: Diamond
Rating:     Points: 5



ASP.NET Page Loading events before and after post-back



When a page is loaded for the first time, there are 22 events that gets triggered before it is done so. The following is the list of those events:


Begin PreInit
End PreInit
Begin Init
End Init
Begin InitComplete
End InitComplete
Begin PreLoad
End PreLoad
Begin Load
End Load
Begin LoadComplete
End LoadComplete
Begin PreRender
End PreRender
Begin PreRenderComplete
End PreRenderComplete
Begin SaveState
End SaveState
Begin SaveStateComplete
End SaveStateComplete
Begin Render
End Render


On subsequent times, say when the page is loaded for the second time after the user submits the page, there are 32 events that get triggered. The following is the list of those events that get raised after a post-back.


Begin PreInit
End PreInit
Begin Init
End Init
Begin InitComplete
End InitComplete
Begin LoadState
End LoadState
Begin ProcessPostData
End ProcessPostData
Begin PreLoad
End PreLoad
Begin Load
End Load
Begin ProcessPostData Second Try
End ProcessPostData Second Try
Begin Raise ChangedEvents
End Raise ChangedEvents
Begin Raise PostBackEvent
End Raise PostBackEvent
Begin LoadComplete
End LoadComplete
Begin PreRender
End PreRender
Begin PreRenderComplete
End PreRenderComplete
Begin SaveState
End SaveState
Begin SaveStateComplete
End SaveStateComplete
Begin Render
End Render



Summary


This difference in the page load events before and after postback is significant and is not a interview question.



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