[Description] In the start step, page properties such as Request and Response are set. At this stage, the page also determines whether the request is a postback or a new request and sets the IsPostBack property. Additionally, during the start step, the page's UICulture property is set. [Stage] 
Start
P a g e r e q u e s t
S t a r t
P a g e i n i t i a l i z a t i o n
L o a d
V a l i d a t i o n
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