Anatomy of an ASP.NET Page in C#

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5 Anatomy of an ASP.NET Page
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along with other information. A typical value for the ViewStateUserKey property is the name of the authenticated user or the user s session ID. This contrivance reinforces the security level for the view state information and further lowers the likelihood of attacks. If you employ a user-specific key, an attacker can t construct a valid view state for your user account unless the attacker can also authenticate as you. With this configuration, you have another barrier against one-click attacks. This technique, though, might not be effective for Web sites that allow anonymous access, unless you have some other unique tracking device running. Note that if you plan to set the ViewStateUserKey property, you must do that during the Page_Init event. If you attempt to do it later (for example, when Page_Load fires), an exception will be thrown.
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Context Properties
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Table 5-10 lists properties that represent visual and nonvisual attributes of the page, such as the URL s query string, the client target, the title, and the applied style sheet.
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TABLE 5-10
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Page-Specific Properties of the Page Class
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Description
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Always returns the empty string. Determines the algorithm to use to generate the ID of HTML elements being output as part of a control s markup. This property requires ASP.NET 4. Gets the query string portion of the requested URL. Set to the empty string by default; allows you to specify the type of browser the HTML should comply with. Setting this property disables automatic detection of browser capabilities. Indicates whether the page has to manage view-state data. You can also enable or disable the view-state feature through the EnableViewState attribute of the @Page directive. Indicates whether ASP.NET should calculate a machine-specific authentication code and append it to the page view state. Indicates whether the page supports themes. Always returns the empty string. Gets and sets the content of the description meta tag. This property requires ASP.NET 4. Gets and sets the content of the keywords meta tag. This property requires ASP.NET 4. Indicates whether to return the user to the same position in the client browser after postback. Indicates whether smart navigation is enabled. Smart navigation exploits a bunch of browser-specific capabilities to enhance the user s experience with the page.
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Property
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ClientID ClientIDMode
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ClientQueryString ClientTarget
EnableViewState
EnableViewStateMac EnableTheming ID MetaDescription MetaKeywords MaintainScrollPositionOnPostback SmartNavigation
Part II
ASP.NET Pages and Server Controls
Property
StyleSheetTheme Theme Title TraceEnabled TraceModeValue UniqueID ViewStateEncryptionMode ViewStateMode Visible
Description
Gets or sets the name of the style sheet applied to this page. Gets and sets the theme for the page. Note that themes can be programmatically set only in the PreInit event. Gets or sets the title for the page. Toggles page tracing on and off. Gets or sets the trace mode. Always returns the empty string. Indicates if and how the view state should be encrypted. Enables the view state for an individual control even if the view state is disabled for the page. This property requires ASP.NET 4. Indicates whether ASP.NET has to render the page. If you set Visible to false, ASP.NET doesn t generate any HTML code for the page. When Visible is false, only the text explicitly written using Response.Write hits the client.
The three ID properties (ID, ClientID, and UniqueID) always return the empty string from a Page object. They make sense only for server controls.
Methods of the Page Class
The whole range of Page methods can be classified in a few categories based on the tasks each method accomplishes. A few methods are involved with the generation of the markup for the page; others are helper methods to build the page and manage the constituent controls. Finally, a third group collects all the methods related to client-side scripting.
Rendering Methods
Table 5-11 details the methods that are directly or indirectly involved with the generation of the markup code.
TABLE 5-11
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