create a qr code using c# and asp.net The <system.web> Section in C#.NET

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The <system.web> Section
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The <system.web> section contains all the configuration elements that set up the ASP.NET runtime environment and controls how ASP.NET applications behave. Table 3-3 lists the entire sequence of first-level elements and their override level.
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TABLE 3-3
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The Full List of Important Sections Allowed Within <system.web>
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Overridable
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Machine, application Machine, application Everywhere Everywhere Everywhere Everywhere Machine, application Machine only
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Section
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<anonymousIdentification> <authentication> <authorization> <browserCaps> <clientTarget> <compilation> <customErrors> <deployment>
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Description
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Configures identification for users that are not authenticated. Sets the authentication mechanism. Indicates authorized users. Lists known browser capabilities. Lists predefined client targets. Settings for batch compilation. Settings for custom error pages. Indicates how the application is deployed.
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Part I The ASP.NET Runtime Environment
Section
<deviceFilters> <fullTrustAssemblies> <globalization> <healthMonitoring> <hostingEnvironment>
Overridable
Everywhere Machine, application Everywhere Machine, application Machine, application
Description
Lists known mobile device capabilities. Lists full-trust assemblies for the application. Settings for application localization. Settings to monitor the status of the application. Defines configuration settings that control the behavior of the application hosting environment. Configures properties for cookies used by an ASP.NET application. Lists registered HTTP handlers. Lists registered HTTP modules. Lists HTTP runtime settings. Sets impersonation. Encryption key for sensitive data. Configures the behavior of mobile controls. In ASP.NET 4.0, mobile controls are deprecated. Defines settings for user authentication via ASP.NET membership. Controls features of ASP.NET pages. Lists partial-trust visible assemblies for the application Configures the process model. Defines settings for user profile s data model. Defines settings for role management. Defines allowed trust levels. Defines page view-state settings for mobile controls. Configures the Session object. Defines settings used to support the navigation infrastructure. Configures the tracing system. Defines the default trust level.
<httpCookies> <httpHandlers> <httpModules> <httpRuntime> <identity> <machineKey> <mobileControls>
Everywhere Everywhere Everywhere Everywhere Everywhere Machine, application Everywhere
<membership>
Machine, application
<pages> <partialTrustVisibleAssemblies> <processModel> <profile> <roleManager> <securityPolicy> <sessionPageState> <sessionState> <siteMap> <trace> <trust>
Everywhere Machine, application MachineOnly Machine, application Machine, application Machine, application Everywhere Machine, application Machine, application Everywhere Machine, application
3 ASP.NET Configuration
Section
<urlMappings> <webControls> <webParts> <webServices>
Overridable
Machine, application Everywhere Everywhere Everywhere
Description
Defines routes mapping a requested URL to a real page. Locates client scripts. Managed Web Parts. Configures Web services. The Web Services technology is considered obsolete, as is this section. Defines settings for XHTML conformance.
<xhtmlConformance>
Everywhere
Each of the elements listed in Table 3-3 features its own schema and provides attributes and enumerations to pick values from. In addition to the sections listed in Table 3-3, the <system.web> group contains a subgroup named <Caching>. Table 3-4 lists the child elements.
TABLE 3-4
Sections Allowed Within <Caching>
Overridable
Machine, application Machine, application Machine, application Machine, application
Section
<cache> <outputCache> <outputCacheSettings> <sqlCacheDependency>
Description
Configures the global cache settings for an ASP.NET application. Configures the output cache for a Web application. Defines caching profiles. Configures the SQL cache dependencies for an ASP.NET application.
Let s examine some of the aforementioned sections in a bit more detail. For a complete reference, though, you might want to check out the excellent MSDN online documentation starting at http://msdn.microsoft.com/en-us/library/b5ysx397.aspx.
The <anonymousIdentification> Section
Anonymous identification is a feature that assigns a predefined identity to users who connect anonymously to an application. Anonymous identification has nothing to do with the anonymous user you can set at the IIS level, nor does it affect the authentication mechanism of ASP.NET. The feature is designed to work with the user profile API to simplify the way you write code in scenarios where both authenticated and unauthenticated users can use the site.
Part I The ASP.NET Runtime Environment
The <anonymousIdentification> section allows you to configure how it works. Here s the overall schema of the section:
<anonymousIdentification enabled="[true | false]" cookieless="[UseUri | UseCookies | AutoDetect | UseDeviceProfile]" cookieName="" cookiePath="" cookieProtection="[None | Validation | Encryption | All]" cookieRequireSSL="[true | false]" cookieSlidingExpiration="[true | false]" cookieTimeout="[DD.HH:MM:SS]" domain="cookie domain" />
Basically, anonymous identification creates a cookied or cookieless ticket and associates it with the ongoing request. The enabled attribute turns the feature on and off; the cookieless attribute instructs the ASP.NET runtime about cookie usage. Table 3-5 illustrates the options for the cookieless attribute.
TABLE 3-5
Options for the cookieless Attribute
Description
Uses cookies if the browser has cookie support currently enabled. It uses the cookieless mechanism otherwise. Always uses cookies, regardless of the browser capabilities. Uses cookies if the browser supports them, and uses the cookieless mechanism otherwise. When this option is used, no attempt is made to check whether cookie support is really enabled for the requesting device. This is the default option. Never uses cookies, regardless of the browser capabilities.
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