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ASP .Net Page Life cycle

Posted By: rakesh On:6/7/2011 10:26:32 PM in:Articles Category:ASP.NET Hits:6526
Intoduction to ASP .Net Page Life cycle

1. OnInit (Init) Initializes each child control of the current page.

2. LoadControlState: Loads the ControlState of the control. To use this 
method the control must call the Page.RegisterRequiresControlState method in 
the OnInit method of the control.

3. LoadViewState: Loads the ViewState of the control.

4. LoadPostData: Is defined on interface IPostBackDataHandler. Controls that 
implement this interface use this method to retrieve the incoming form data and 
update the control s properties accordingly.

5.Load (OnLoad): Allows actions that are common to every request to be 
placed here. Note that the control is stable at this time; it has been 
initialized and its state has been reconstructed.

6. RaisePostDataChangedEvent: Is defined on the interface IPostBackData-Handler. 
Controls that implement this interface use this event to raise change events in 
response to the Postback data changing between the current Postback and the 
previous Postback. For example if a TextBox has a TextChanged event and 
AutoPostback is turned off clicking a button causes the Text-Changed event to 
execute in this stage before handling the click event of the button which is 
raised in the next stage.

7. RaisePostbackEvent: Handles the client-side event that caused the Postback 
to occur.

8. PreRender (OnPreRender): Allows last-minute changes to the control. This 
event takes place after all regular Post-back events have taken place. This 
event takes place before saving ViewState so any changes made here are saved.

9. SaveControlState: Saves the current control state to ViewState. After this 
stage any changes to the control state are lost. To use this method the 
control must call the Page.RegisterRequiresControlState method in the OnInit 
method of the control.

10. SaveViewState: Saves the current data state of the control to ViewState. 
After this stage any changes to the control data are lost.

11. Render: Generates the client-side HTML Dynamic Hypertext Markup Language 
(DHTML) and script that are necessary to properly display this control at the 
browser. In this stage any changes to the control are not persisted into 
ViewState.

12. Dispose: Accepts cleanup code. Releases any unman-aged resources in this 
stage. Unmanaged resources are resources that are not handled by the .NET common 
language runtime such as file handles and database connections.

13. UnLoad

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