Hi Kayleigh,

The 3 levels at which content pages can be attached to Master Page are as follows,

1. At the page level - You can use a page directive in each content page to bind it to a master page.

 2. At the application level - By making a setting in the pages element of the application's configuration file (Web.config), you can specify that all ASP.NET pages (.aspx files) in the application automatically bind to a master page.

3. At the folder level - This strategy is like binding at the application level, except that you make the setting in a Web.config file in one folder only. The master-page bindings then apply to the ASP.NET pages in that folder.