asp.net page life cycle

Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

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ASP .Net Page Life Cycle

Muhammed Ajmalajuik2008@gmail.comwww.facebook.com/usernametwitter.com/usernamein.linkedin.com/in/profilename9745020951

Overview

• Introduction• General stages• Events

Introduction

When a web page is requested to the web server, it goes through a series of sequence of steps before it is returned back to the web browser.

1. Web Application creates an instance of the requested web form.

2. Processes the events of the web form.

3. Generates the HTML, and sends the HTML back to the requested client.

4. The web form gets destroyed and removed from the memory. 

Genera Steps

• S = Start • I  = Initialization • L = Load• V = Validate• E = Event Handlers• R = Render

Postback

• A Post Back is any request for a page that is not the first request.– Check post back using isPostback()

View state

• The view state store the page specific information when a page posted back to the server.

Page life cycle Events

PreInit

• Raised after the start stage is complete and before the initialization stage begins– set isPostBack property– Possible to change or set Master page, themes– Creates or recreates dynamic controls

Page_PreInit

Page_Init

• Raised after all controls have been initialized and any skin settings have been applied.

• The Page_Init event fires only the first time the page is loaded.

Init Complete•View state functionality is turned on for server control

PreLoad

•PreLoad executes after InitComplete method.

• page has loaded values from view state.

PreLoad

Load()• This event loads individual controls. • We can create the connection initialization for any kind of

external source like database connection• We can also set the control properties• We can created our own Load method

Control events

• Use these events to handle specific control events,• If this is an postback request , Corresponding events will

triggered.

• Control events

LoadComplete

• This event can be used when all the event processing has been done in the page.

PreRender

• Each control of the page has a PreRender event which is being invoked.

• DataBind method for all control has also been called• If we want to change any thing to any control this is the

last event where we can do because after the pageRender starts

• SaveViewState

• ViewState Monitoring is turned off as here all the ViewState Data need to be saved.

• View State data saved in hidden filed called _VIEWSTATE

•RenderPages• calls the Render method for each and every

control.• Text writer that writes the output to the as output

stream• Output steam set to the page's Response property.

Unload 

• This is the last event of asp.net page life cycle• This ensure the Request and Response has been set to

null.• This is called only after the content of the page fully

rendered and response sent to client

Order of execution

Thank you

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