Directives in asp.net..

1) @ Assembly: Links an assembly to the current page or user control declaratively.
2) @ Control : Defines control-specific attributes used by the ASP.NET page parser and compiler and can be included only in .ascx files (user controls).
3) @ Implements : Indicates that a page or user control implements a specified .NET Framework interface declaratively.
4) @ Import: Imports a namespace into a page or user control explicitly.
5) @ Master: Identifies a page as a master page and defines attributes used by the ASP.NET page parser and compiler and can be included only in .master files.
6) @ MasterType : Defines the class or virtual path used to type the Master property of a page.
7) @ OutputCache : Controls the output caching policies of a page or user control declaratively.
8) @ Page : Defines page-specific attributes used by the ASP.NET page parser and compiler and can be included only in .aspx files.
9) @ PreviousPageType: Creates a strongly typed reference to the source page from the target of a cross-page posting.
10) @ Reference : Links a page, user control, or COM control to the current page or user control declaratively.
11) @ 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