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ASP.NET Page Life Cycle
The document discusses the ASP.NET page lifecycle. It begins with an introduction explaining that a requested web page goes through a series of steps on the server before being returned to the browser. It then outlines the main stages of the lifecycle including initialization, load, processing of events, rendering, and unload. Finally, it provides more details on specific events within each stage such as Page_Init and Load and the order in which they are executed.
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ASP.NET Page Life Cycle
- 2. Disclaimer: This presentationis prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. Week Target Achieved 130 22 2 30 23 3 30 25 Typing Speed
- 4. Jobs Applied Week CompanyDesignation Applied Date Current Status 1 2 3
- 5. ASP .Net PageLife Cycle MuhammedAjmal ajuik2008@gmail.com www.facebook.com/username twitter.com/username in.linkedin.com/in/profilename 9745020951
- 6. Overview • Introduction • Generalstages • Events
- 7. Introduction When a webpage 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.
- 8. Genera Steps • S= Start • I = Initialization • L = Load • V = Validate • E = Event Handlers • R = Render
- 9. Postback • A PostBack 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.
- 10. Page life cycleEvents
- 11. PreInit • Raised afterthe 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
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- 13. Page_Init • Raised afterall 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
- 14. PreLoad •PreLoad executes afterInitComplete method. • page has loaded values from view state.
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- 16. Load() • This eventloads 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
- 17. Control events • Usethese events to handle specific control events, • If this is an postback request , Corresponding events will triggered.
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- 19. LoadComplete • This eventcan be used when all the event processing has been done in the page.
- 20. PreRender • Each controlof 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
- 21. • SaveViewState • ViewStateMonitoring is turned off as here all the ViewState Data need to be saved. • View State data saved in hidden filed called _VIEWSTATE
- 22. •RenderPages • calls theRender 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.
- 23. Unload • This isthe 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
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