Sharepoint page Life Cycle:
1.User request the SharePoint page using http
2.Asp.Net calls the WSS file Provider
3.WSS file Provider return the pages from file or database
4.page is parsed by SafeMode parsor if required
5.Returned page is compiled by Asp.Net compiler
6.WSS file Provider collects the page layout class and complies it
7.Asp.Net engine adds SharePoint Context Data to the site meta data and retrieves the associatedmaster page.
8.Master page got compiled responded back to the user.