ASP PAGE LIFE CYCLE

ASP PAGE LIFE CYCLE

Introduction:

     The life cycle of an asp.net page can be understandable easily if you have a knowledge of some keywords like viewstate, postback and events in asp.net . 

Description:

PreInit -

* In preinit you can check weather the page is loaded first time             or  not using IsPostBack property.
* On the first time load page you can create control with values.
* You can set master page and theme dynamically.

* If the page is postback, you can set control property value to           be overwritten. 
 * The values have not been yet restored from viewstate.
     
Init -

* In the Init event of the individual controls occurs first, later               the Init event of the Page takes place.
 * This event is used to initialize control properties.

InitComplete -

* In the InitComplete event the viewstate property checking will be done and that changes will be persisted until next postback.

PreLoad -
* This will process the data on postback event with the request.

Load -
* In this process the initial Page controls or objects calls the OnLoad method and that method with any controls or objects comes next.

ControlEvents -

* This events occurs after page loads like onclick in button, textchanged in textbox, onchange in dropdownlist etc.

In case of the postback, 
if the page contains validator controls , the page.isvalid property and the validation of the control takes place before the firing of individual events.

Load Complete - 

* This session occurs after the event handling page.
* This will complete all controls and their methos events.

Pre Render -

* This method is used to make final changes to the controls on the page like assigning the DataSourceId and calling the DataBind method.

PreRenderComplete -

* This event is raised after all the final id values are set in prerender completes.

SaveStateComplete -

* This will occur after control state and view state saved.

RenderComplete -

* This method writes the controls values or markup to the browser.

Unload -

* This event is raised for each control and then for the page.

* This will do the final clean up work and close dataconnection etc.,

If any clarification or need changes please comment.
Thank you!