ASP.NET - Directives

 W H A T I T M E A N S ?
 H O W T O U S E ?
 T Y P E S
 A T T R I B U T E S
 Q & A
ASP.NET - Directives
Dhammapal Kamble - Sr. Software Developer 19 June 2019

ASP.NET – Directives : What it means?
The directives are instructions that specify optional
settings in Asp.Net.
These instructions include registering a custom
control, page language etc.
It describes how the .aspx pages (web forms) or .ascx
pages (user controls) are processed by the .Net
framework.

ASP.NET – Directives : How to use?
The syntax for declaring a directive is:
<%@ directive_name attribute=value
[attribute=value] %>
Page Directives can be placed anywhere in .aspx or
.ascx file. But standard practice is to include them at
the top .

ASP.NET – Directives :Types
 Application Directive
 Assembly Directive
 Control Directive
 Implements Directive
 Import Directive
 Master Directive
 MasterType Directive
 OutputCache Directive
 Page Directive
 PreviousPageType Directive
 Reference Directive
 Register Directive

ASP.NET – Directives : Application Directive
 The Application directive is used to define
application-specific attributes.
 It is provided at the top of the global.aspx file.
Attributes Description
Inherits The name of the class from which to inherit.
Description The text description of the application. Parsers and
compilers ignore this.
Language The language used in code blocks.

ASP.NET – Directives : Assembly Directive
 The Assembly directive links an assembly to the page or
the application at parse time.
 This could appear either in the global.asax file for
application-wide linking, in the page file, a user control
file for linking to a page or user control.
Name The name of the assembly to be linked.
Src The path to the source file to be linked and compiled
dynamically.

ASP.NET – Directives : Control Directive
 The control directive is used with the user controls and
appears in the user control (.ascx) files.
AutoEventWireup The Boolean value that enables or disables automatic
association of events to handlers.
ClassName The file name for the control.
Debug The Boolean value that enables or disables compiling
with debug symbols.
Description The text description of the control page, ignored by
compiler.
EnableViewState The Boolean value that indicates whether view state is
maintained across page requests.
Explicit For VB language, tells the compiler to use option explicit
mode.
Continue.

ASP.NET – Directives : Control Directive
Inherits The class from which the control page inherits.
Language The language for code and script.
Src The filename for the code-behind class.
Strict For VB language, tells the compiler to use the option
strict mode.

ASP.NET – Directives : Implements Directive
 The Implement directive indicates that the web page,
master page or user control page must implement the
specified .Net framework interface.
 <%@ Implements Interface="interface_name" %>

ASP.NET – Directives : Import Directive
 The Import directive imports a namespace into a
web page, user control page of application.
 <%@ namespace="System.Drawing" %>

ASP.NET – Directives : Master Directive
 The Master directive specifies a page file as being the mater page.
<%@ MasterPage Language="C#" AutoEventWireup="true"
CodeFile="SiteMater.master.cs" Inherits="SiteMaster" %>

ASP.NET – Directives : MasterType Directive
 The MasterType directive assigns a class name to the
Master property of a page, to make it strongly typed.
<%@ MasterType attribute="value"[attribute="value" ...]
%>

ASP.NET – Directives : OutputCache Directive
 The OutputCache directive controls the output caching
policies of a web page or a user control.
<%@ OutputCache Duration="10" VaryByParam="None"
%>
duration="10” - it tells the page how many seconds to
cache the content
VaryByParam – cache depending upon parameter value

ASP.NET – Directives : Page Directive
 The Page directive defines the attributes specific to the page
file for the page parser and the compiler.
AutoEventWireup The Boolean value that enables or disables page events
that are being automatically bound to methods; for
example, Page_Load.
Buffer The Boolean value that enables or disables HTTP
response buffering.
ClassName The class name for the page.
ClientTarget The browser for which the server controls should render
content.
CodeFile The name of the code behind file
Description The text description of the page, ignored by the parser.
Continue.

ASP.NET – Directives : Page Directive
EnableSessionState It enables, disables, or makes session state read-only.
EnableViewState The Boolean value that enables or disables view state
across page requests.
ErrorPage URL for redirection if an unhandled page exception
occurs.
Inherits The name of the code behind or other class.
Src The file name of the code behind class.
Trace It enables or disables tracing.
TraceMode It indicates how trace messages are displayed, and sorted
by time or category.
Transaction It indicates if transactions are supported.
Language The programming language for code.

ASP.NET – Directives
 PreviousPageType directive
 assigns a class to a page, so that the page is strongly typed.
 Reference Directive
 The Reference directive indicates that another page or user control should
be compiled and linked to the current page.
<%@ Reference Page ="somepage.aspx" %>
 The Register Directive
 The Register derivative is used for registering the custom server controls
and user controls.
<%@ Register Src="~/footer.ascx" TagName="footer" TagPrefix="Tfooter"
%>

ASP.NET – Directives : Questions
Thank You !

ASP.NET - Directives

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