Phase
|
What a control
needs to do
|
Method or event to
override
|
Initialize
|
Initialize
settings needed during the lifetime of the incoming Web request.
|
Init
event (OnInit
method)
|
Load
view state
|
At
the end of this phase, the ViewState property of a control is
automatically populated as described in MaintainingState
in a Control. A control can override the default implementation of the LoadViewState
method to customize state restoration.
|
LoadViewState
method
|
Process
postback data
|
Process
incoming form data and update properties accordingly.
|
LoadPostData
method (if IPostBackDataHandler
is implemented)
|
Load
|
Perform
actions common to all requests, such as setting up a database query. At this
point, server controls in the tree are created and initialized, the state is
restored, and form controls reflect client-side data.
|
Load
event
(OnLoad
method)
|
Send
postback change notifications
|
Raise
change events in response to state changes between the current and previous
postbacks.
|
RaisePostDataChangedEvent
method (if IPostBackDataHandler
is implemented)
|
Handle
postback events
|
Handle
the client-side event that caused the postback and raise appropriate events
on the server.
|
RaisePostBackEvent
method(if IPostBackEventHandler
is implemented)
|
Prerender
|
Perform
any updates before the output is rendered. Any changes made to the state of
the control in the prerender phase can be saved, while changes made in the
rendering phase are lost.
|
PreRender
event
(OnPreRender method)
|
Save
state
|
The
ViewState property of a control is automatically persisted to a string
object after this stage. This string object is sent to the client and back as
a hidden variable. For improving efficiency, a control can override the SaveViewState
method to modify the ViewState property.
|
SaveViewState
method
|
Render
|
Generate
output to be rendered to the client.
|
Render
method
|
Dispose
|
Perform
any final cleanup before the control is torn down. References to expensive
resources such as database connections must be released in this phase.
|
Dispose
method
|
Unload
|
Perform
any final cleanup before the control is torn down. Control authors generally
perform cleanup in Dispose and do not handle this event.
|
UnLoad
event
(On UnLoad method)
|