Table 1. Key events in the life of an ASP.NET page
Stage
Page Event
Overridable method
Page initialization
Init

View state loading

LoadViewState
Postback data processing

LoadPostData method in any control that implements the IPostBackDataHandler interface
Page loading
Load

Postback change notification

RaisePostDataChangedEvent method in any control that implements the IPostBackDataHandler interface
Postback event handling
Any postback event defined by controls
RaisePostBackEvent method in any control that implements the IPostBackEventHandler interface
Page pre-rendering phase
PreRender

View state saving

SaveViewState
Page rendering

Render
Page unloading
Unload