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Please briefly explain ASP.NET Page life Cycle?

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ASP.NET page passes through a series of steps during its life cycle. Following is the high-level explanation of life cycle stages/steps.

Initialization: Controls raise their Init event in this stage.Objects and variables are initializes for complete lifecycle of request.
LoadViewState: is a post back stage and loads the view state for the controls that enabled its view state property.

LoadPostBackData: is also a post back stage and loads the data posted for the controls and update them. 
Load: In this stage page as well as all the controls raise their Load event. Till this stage all the controls are initialized and loaded. In most of the cases, we are coding this event handler.
RaisePostBackEvent: is again a postback stage. For example, it’s raise against a button click event. We can easily put our code here to perform certain actions.
SaveViewState: Finally, controls state is saved in this stage before Rendering HTML.
Render: This is the stage where HTML is generated for the page.
Dispose: Lastly, all objects associated with the request are cleaned up.

posted Jan 24, 2017 by Shivaranjini

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Global.asax is basically ASP.NET Application file. It’s a place to write code for Application-level events such as Application start, Application end, Session start and end, Application error etc. raised by ASP.NET or by HTTP Modules.

There is a good list of events that are fired but following are few of the important events in Global.asax:

  • Application_Init occurs in case of application initialization for the very first time.
  • Application_Start fires on application start.
  • Session_Start fires when a new user session starts
  • Application_Error occurs in case of an unhandled exception generated from application.
  • Session_End fires when user session ends.
  • Application_End fires when application ends or time out.
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