Hi.. ASP.Net webpage execution will perform several steps for processing page, this is called asp.net page life cycle. the steps are 1)preInit 2)Init 3)preload 4)Load 5)PreRender 6)Render 7)Unload

Hi..
ASP.Net webpage execution will perform several steps for processing page, this is called asp.net page life cycle. the steps are
1) Page Request
2)Start
3)Page initialization
4)Page Load
5)Post Back events execution
6)Rendering
7)Unload

Stage	Events/Method
Page Initialization	Page_Init
View State Loading	LoadViewState
Postback data processing	LoadPostData
Page Loading	Page_Load
PostBack Change Notification	RaisePostDataChangedEvent
PostBack Event Handling	RaisePostBackEvent
Page Pre Rendering Phase	Page_PreRender
View State Saving	SaveViewState
Page Rendering	Page_Render
Page Unloading	Page_UnLoad

1. OnInit (Init)  -- Inializes all Child controls on the Page

2. LoadControlState  -- Loads the Control State 

3. LoadViewState -- Loads the View State

4. LoadPostData -- Control properties are set according to the received form data

5. Load -- Actions can be performed on the controls as all the pre-activities are complete by this time

6. RaisePostDataChangedEvent -- This event is raised if data has been changed in previous and Current Postbacks.

7. RaisePostBackEvent -- This event handles the user action that caused the Postback.

8. PreRender (OnPreRender) -- This event takes place between postback and saving viewstate. Till this stage changes will be saved to the control.

9. SaveControlState -- Self Explanatory

10. SaveViewState -- Self Explanatory

11. Render -- Generates artifacts at Client side (HTML,DHTML,Scripts) to properly display controls

12. Dispose -- Releases unmanaged Resource ( Database connections, file handles)

13. Unload -- Releases managed Resources ( Instances created by CLR)

While excuting the page, it will go under the fallowing steps(or fires the events) which collectivly known as Page Life cycle.

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