Event firing order becomes critically important when you add event handling code to master pages and the content forms based on them. The following events occur when ASP.NET renders a page. I’ve listed these events in the order in which they occur.
1 :-Content Page Pre Initializes
2 :-Master Page Child Controls Initialize
3 :-Content Page Child Controls Initialize
4 :-Master Page Initializes
5 :-Content Page Initializes
6 :-Content Page Initialize Complete
7 :-Content Page Pre Loads
8 :-Content Page Loads
9 :-Master Page Loads
10 :-Master Page Child Controls Load
11 :-Content Page Child Controls Load
12 :-Content Page Load Complete
1 :-Content Page Pre Initializes
2 :-Master Page Child Controls Initialize
3 :-Content Page Child Controls Initialize
4 :-Master Page Initializes
5 :-Content Page Initializes
6 :-Content Page Initialize Complete
7 :-Content Page Pre Loads
8 :-Content Page Loads
9 :-Master Page Loads
10 :-Master Page Child Controls Load
11 :-Content Page Child Controls Load
12 :-Content Page Load Complete