The stsges of Page life cycle are as follows :
Methods
|
Description
|
Page_Init
|
Page Initialization
|
LoadViewState
|
View State Loading
|
LoadPostData
|
Postback Data Processing
|
Page_Load
|
Page Loading
|
RaisePostDataChangedEvent
|
PostBack Change Notification
|
RaisePostBackEvent
|
PostBack Event Handling
|
Page_PreRender
|
Page Pre Rendering Phase
|
SaveViewState
|
View State Saving
|
Page_Render
|
Page Rendering
|
Page_Unload
|
Page Unloading
|
Page_Init :
The Page_Init event is the first event to be triggered in the page life
cycle. In this the control tree has been created, the controls declared in the .aspx
file are initialized. The viewstate is not available at this stage. We can create
or re-create the controls that need to be created or re-created dynamically.
LoadViewState :
The Viewstate contains stored information that is set by the page and controls
of the page. But the load view state event only occurs when the page has been posted
back. Due to viewstate control's and page itself store information that is persistent
among web requests. It contains the state of the controls the last time the page
was processed on the server.
LoadPostData :
After viewstate is loaded the control
are updated with posted values or values that are entered or changed by user.
Page_Load :
After Loadpostdata the page_load event is fired. In this event code written inside
page load is executed once at the beginning of the page.
RaisePostDataChangedEvent :
In this event when user clicks submit button or any other button then it changes
state of the page and the event related to that button is raised.
RaisePostBackEvent :
This methods knows which event has occurred and which related method you need to
call like btnsubmit is clicked then it will call method related to it like “btnsubmit_click”
to perform its functionality.
Page_PreRender :
At this stage page is prepared for
Rendering and if user wants to chage anything he can change it here only as in this
event viewstate is not saved and output is not rendered.
SaveViewState :
In this
event values of viewstate is saved to control own viewstate collection. The resultant
viewstate is serialized, hashed, base24 encoded and associated with the _viewstate
hidden field.
Page_Render :
This method takes the HtmlWriter object and uses it
to accumulate all HTML text to be generated for the control. For each control the
page calls the render method and caches the HTML output.
Page_unload :
During this method, data can be released to free up resources on the server for
other processes. Once this method is completed, the HTML is sent to the browser
for client side processing.
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