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Home » Resources » HTML and ASP.NET (From My Course Summarization): The Life Cycle of a page

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HTML and ASP.NET (From My Course Summarization): The Life Cycle of a page

31 May, 2008

Author: Elad Karako
Israeli Netanya Academic College (CS b.Sc)

Summary
The Life Cycle of a page when requested for the first time.

Life cycle when the page processed during a postback event.

The events associated with the relevant page cycle In ASP.NET 2.0.

.NET Classes used :

The Life Cycle of a page when requested for the first time:
Initializing: During this phase, the server creates an instance of the server control
Loading: During this phase, the instance of the control is loaded onto the page object in which it is defined.
PreRendering: During this phase, the control is updated with the changes made to it. This prepares the control for rendering.
Saving: During this phase, the state information of the control is saved. For example, if a value is set for the control during the Load event, it is embedded in the HTML tag that will be returned to the browser.
Rendering: During this phase, the server creates the corresponding HTML tag for the control.
Disposing: During this phase, all cleanup tasks, such as closing files and database connections opened by the control are performed.
Unloading: During this phase, all cleanup tasks, such as destroying the instances of server control are performed. This is the final event in the life cycle of a server control

Life cycle when the page processed during a postback event
Initializing: During this phase, the server creates an instance of the server control
Loading view state: During this phase, the view state of the control posted by the client is reloaded into the new instance of the control.
Loading: During this phase, the instance of the control is loaded onto the page object in which it is defined.
Loading the postback data: During this phase, the server searches any data corresponding to the control that is loaded in the data posted by the client.
PreRendering: During this phase, the control is updated with the changes made to it. This prepares the control for rendering.
Saving state: During this phase, the change in the state of control between the current request and the previous request of the page is saved. For each change, the corresponding event is raised. For example, if the text of a textbox is changed, the new text is saved and a text_change event is raised.
Rendering: During this phase, the server creates the corresponding HTML tag for the control.
Disposing: During this phase, all cleanup tasks, such as closing files and database connections opened by the control are performed.
Unloading: During this phase, all cleanup tasks, such as destroying the instances of server control are performed. This is the final event in the life cycle of a server control

The events associated with the relevant page cycle In ASP.NET 2.0

Stage	Event	What To Do	What Done
Initialization	Page PreInit	- change themes, master pages - access properties for a profile	master pages, themes, etc. are applied
	Control Init Page Init	- read or initialize properties of controls in the control hierarchy. - add dynamic controls that need to utilize view state	Controls are initialized with declarative properties.
	Page InitComplete	- access controls on the page	Begin to track view state changes
Page Load	Page PreLoad		View state data saved from the previous page are populated to the controls. Postback data are restored
	Page Load Control Load
Raise Postback Event			Control events are handled
	Page LoadComplete
PreRender	Page PreRender
	Page PreRenderComplete		All controls have been added to the page and the page is ready to be rendered
Save View State			View state and control state have been saved
	Page SaveStateComplete
Render			HtmlTextWriter is initialized and the page is rendered to the browser
Unload	Control Unload Page Unload

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