ASP. NET page event process-page_init () and page_load ()

After testing this morning, we figured out the execution process when there are multiple user controls on the page.
Usercontrol1.ascx and usercontrol2.ascx are user controls created in test. aspx successively:

Procedure	Test. aspx	Usercontrol1.ascx	Usercontrol2.ascx
1		Oninit
2		Init
3			Oninit
4			Init
5	Oninit
6	Init
7	Load
8		Load
9			Load
10	(Buttom_click ...)	(Buttom_click ...)	(Buttom_click ...)
11	Prerender
12		Prerender
13			Prerender
14		Unload
15			Unload
16	Unload

1. When init is triggered, the control is available, but the control is not initialized through the viewstate object.
2. After all controls are initialized through the viewstate object, load