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ASP.Net Page Life Cycle
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Page Life cycle in asp.net means
the various stages of the webpage will undergo with in IIS
Once the page request is submitted to
server.
There are overall 8 stages
available for any webpage that will undergo with in server at page life cycle.
1)Page Request
2)Start
3)Page Intialization
4)Load
5)validation
6)PostBack Event Handling
7)Rendering
8)Unload
1)Page Request:-
The
page request will occur before the page life cycle begins,when the page is
requested by the user asp.net run time will determine whether cached version of
the page should be sent to client (or) page should be generated.
2)start:-
During
this stage properties for a page like request,Response are set
At
this stage,page also determines whether the request is first request/postback
request and Ispostback property will set accordingly.
3)PageIntialization:-
At
this stage all the controls of the page are available and unique Id property of
every control will be set.
4)Load:-
During
this stage all controls,properties will be loaded into the memory,properties
values will be taken from code(or) recovered from viewstate
5)Validation:-
During
this stage validate method of all validation controls is called,Isvalid
property will be set accordingly for this control and also from the page.
6)PostBackEvent Handling:-
During
this stage the controls postbackEvent will be fired by using which postBack of
the page is caused.
7)Rendering:-
Before rendering state for every
control and view state for the page are saved
Render method will be called for
every control and for the page then complete code id converted clientside understandable from then result is delivered
to client.
8)Unload:-
Unload is called once the complete
result is delivered to client.
During this stage the objects are
completely destroyed for all controls as well as for the page and meomroy is
released.
Events
associated with PageLifeCycle:-
1)PreInit:-
Use this event to perform the
following tasks.
a)To check the request first request or postback request
b)to crate or recreate controls dynamically
2)Init:-
This event is fired after all
controls have been initialized use this event to perform the following task.
a)to read the control properties or to initialize the
control properties
3)InitComplete:-
This event is raised by the page
object. Use this event for processing any kind
of task that requires after all initialization is completed.
4)PreLoad:-
Use this event to perform any kind of
processing before the load event.
5)Load:-
During this event first runtime will
call load method for all the child controls to parent controls to load complete
properties and data.
Use this event to perform the
following
tasks:-
1)To set/get this control property
values
2)to establish connections etc
6)Control
Event:-
Use this event to perform the specifc
task based on the requirements
This events are like button_click
,textbox_textchanged,Radiobutton_checkedchaanged ..etc
7)Load
complete:-
Use this event to perform the tasks
that requires after all the controls on the page are loaded
8)Prerender:-
In general this event will be fired
for each control of the page.
Use this event to make any final
changes that are required to be performed for the controls(or) for this page.
9)Savestate complete:-
Before this event viewstate has been
saved for the page and for all the controls.
Use this events to perform any task
is be saved into viewstate.
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