Web Page/Server Control Life Cycle Methods and Events

Method (Event) / Description
1. OnInit (Init)

Initializes each child control of the current
control.

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

Accepts cleanup code. Releases any managed resources in this stage. Managed resources are resources that are handled by the runtime, such as instances of classes created by the .NET common language runtime.