Directives specify settings that are used by the page and user-control compilers when the compilers process ASP.NET Web Forms pages (.aspx files) and user control (.ascx) files.
ASP.NET treats any directive block (<%@ %>) that does not contain an explicit directive name as an @ Page directive (for a page) or as an @ Control directive (for a user control).
For syntax information and descriptions of the attributes that are available for each directive, use the links that are listed in the following table.
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Directive
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Description
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| @ 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 only in .master files. |
| @ MasterType | Defines the class or virtual path used to type the Master property of a page. |
| @ OutputCache | Controls the output caching policies of a page or user control declaratively. |
| @ Page | Defines page-specific attributes used by the ASP.NET page parser and compiler and can be included only in .aspx files. |
| @ PreviousPageType | Creates a strongly typed reference to the source page from the target of a cross-page posting. |
| @ Reference | Links a page, user control, or COM control to the current page or user control declaratively. |
| @ 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. |
Reference
Application Directives
Concepts
ASP.NET Web Page Syntax Overview