Understanding the complete life cycle is very complicated. In this article I tried to provide you a complete page cycle by using the easiest way.
First to begin the life cycle we have to call method ProcessRequest(), then the cycle begins.
Diagram showing all the stages of a Page Life Cycle: 
All the stages of Page Life Cycle and its relevant methods used are:
(1) Page Initialization = Page_Init
(2) View State Loading = LoadViewState
(3) PostBack data processing = LoadPostData
(4) Page Loading = Page_Load
(5) PostBack Change Notification = RaisePostDataChangedEvent
(6) PostBack Event Handling = RaisePostBackEvent
(7) Page Pre Rendering Phase = Page_PreRender
(8) View State Saving = SaveViewState
(9) Page Rendering = Page_Render
(10) Page Unloading = Page_UnLoad