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The global.asax file is optional, but a web application can have no more than one global.asax file, and it must reside in the root directory of the application, not in a subdirectory. To add a global.asax file to a project, select Website Add New Item and choose the Global Application Class template. When Visual Studio adds a global.asax file, it includes empty event handlers for the most commonly used application events. You simply need to insert your code in the appropriate method. It s worth noting that application event handlers aren t attached in the same way as ordinary control events. The usual way to attach an application event handler is just to use the recognized method name. For example, if you create a protected method named Application_OnEndRequest(), ASP .NET automatically calls this method when the Application.EndRequest event occurs. ASP .NET creates a pool of application objects when your application domain is first loaded and uses one to serve each request. This pool varies in size depending on the system and the number of available threads, but it typically ranges from 1 to 100 instances. Each request gets exclusive access to one of these application objects, and when the request ends, the object is reused. As different stages in application processing occur, ASP.NET calls the corresponding method, which triggers your code. Of course, if your methods have the wrong name, your implementation won t get called instead, your code will simply be ignored.

The global application class that s used by the global.asax file should always be stateless. That s because application objects are reused for different requests as they become available. If you set a value in a member variable in one request, it might reappear in another request. However, there s no way to control how this happens or which request gets which instance of the application object. To circumvent this issue, don t use member variables unless they re static (as discussed in 6).

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You can handle two types of events in the global.asax file: Events that always occur for every request. These include request-related and responserelated events. Events that occur only under certain conditions. The required events unfold in this order: 1. Application_BeginRequest(): This method is called at the start of every request, including requests for files that aren t web forms, such as web services. 2. Application_AuthenticateRequest(): This method is called just before authentication is performed. This is a jumping-off point for creating your own authentication logic. 3. Application_AuthorizeRequest(): After the user is authenticated (identified), it s time to determine the user s permissions. You can use this method to assign special privileges. 4. Application_ResolveRequestCache(): This method is commonly used in conjunction with output caching. With output caching (described in 11), the rendered HTML of a web form is reused, without executing any of your code. However, this event handler still runs. 5. At this point, the request is handed off to the appropriate handler. For example, for a web form request this is the point when the page is compiled (if necessary) and instantiated. 6. Application_AcquireRequestState(): This method is called just before session-specific information is retrieved for the client and used to populate the Session collection.

7. Application_PreRequestHandlerExecute(): This method is called before the appropriate HTTP handler executes the request. 8. At this point, the appropriate handler executes the request. For example, if it s a web form request, the event-handling code for the page is executed, and the page is rendered to HTML. 9. Application_PostRequestHandlerExecute(): This method is called just after the request is handled. 10. Application_ReleaseRequestState(): This method is called when the session-specific information is about to be serialized from the Session collection so that it s available for the next request. 11. Application_UpdateRequestCache():This method is called just before information is added to the output cache. For example, if you ve enabled output caching for a web page, ASP .NET will insert the rendered HTML for the page into the cache at this point. 12. Application_EndRequest(): This method is called at the end of the request, just before the objects are released and reclaimed. It s a suitable point for cleanup code. Figure 5-1 shows the process of handling a single request.

You may have noticed from the previous sections that the data passed in to an authentication backend depends very much on the backend being used. Django, by default, passes in a username and password from its login form, but other forms can supply whatever other credentials as appropriate for the form.

Figure 5-1. The application events Some events don t fire with every request: Application_Start(): This method is invoked when the application first starts up and the application domain is created. This event handler is a useful place to provide application-wide initialization code. For example, at this point you might load and cache data that will not change throughout the lifetime of an application, such as navigation trees, static product catalogs, and so on. Session_Start(): This method is invoked each time a new session begins. This is often used to initialize user-specific information. 6 discusses sessions with state management.

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