Page directives configure the runtime environment that will execute the page. The complete list of directives is as follows: @ Page - Defines page-specific attributes used by the ASP.NET page parser and compiler and can be included only in .aspx files. @ Register - Associates aliases with namespaces and classes, which allow user controls and custom server controls to be rendered when included in a requested page or user control. @ Assembly - Links an assembly to the current page or user control declaratively. @ Control - Defines control-specific attributes used by the ASP.NET page parser and compiler and can be included only in .ascx files (user controls). @ Implements - Indicates that a page or user control implements a specified .NET Framework interface declaratively. @ Import - Imports a namespace into a page or user control explicitly. @ Master - Identifies a page as a master page and defines attributes used by the ASP.NET page parser and compiler and can be included onl