[Description] During page initialization, controls on the page are available and each control's UniqueID property is set. A master page and themes are also applied to the page if applicable. If the current request is a postback, the postback data has not yet been loaded and control property values have not been restored to the values from view state. [Stage] 
Initialization
P a g e r e q u e s t
S t a r t
I n i t i a l i z a t i o n
L o a d
P o s t b a c k e v e n t h a n d l i n g
R e n d e r i n g
U n l o a d