ASP.NET Page Life Cycle

When page is requested its gets loaded into memory after work is being done it is unloaded from the memory.

The page life cycle phases are:

• Initialization
• Instantiation of the controls on the page
• Restoration and maintenance of the state
• Execution of the event handler codes
• Page rendering

• Page request - When ASP.NET gets a page request, it decides whether to load and compile the page,


• Starting of page life cycle - The Request and Response objects are set here. IsPostBack property of the page will be set true if the request is postback or old.


• Page initialization - At this stage, unique ID are assigned to the control on the page and a postback data will be loaded and the control properties will be restored to the view-state values for every new request.


• Page load - By using the view state and control state values the control properties are set at this stage.


• Validation - Validate method of the validation control is called and on its successful execution.


• Postback event handling - The related event handler will be invoked only if the request is a postback.


• Page rendering - At this stage, view state for the page and all controls are saved.


• Unload - The rendered page is sent to the client and page properties, such as Response and Request, are unloaded and all cleanup done.

Following are the page life cycle events:

• PreInit
• Init
• InitComplete
• LoadViewState
• LoadPostData
• PreLoad
• Load
• LoadComplete
• SaveStateComplete
• UnLoad