related masster page

best place to start is: here. Master Page is applied during Initialization. If you want to better understand, place a breakpoint in VS in a content page and then it will go through all page lifecycle events and it will show you the exact order. To note that Page_Load on content page launches before Page_Load of master page.

I have not directly worked with these, but from what I've read and asked around, it's as I said. If I am wrong, please point out. Thanks!!!

yes, it has it's own life cycle. The order is: Content page lifecycle events and then master page lifecycle events. Need more info?