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If you want to find out the path the user has taken through your wizard, you can use the Wizard.GetHistory() method. It returns a collection of WizardStepBase objects that have been accessed so far, arranged in reverse chronological order. That means the first item in the collection represents the previous step, the second item represents the step before that, and so on.

The ASP.NET page handler PageHandlerFactory performs the important task of receiving the user request and creating the Page object for manipulation by the developer. The Page object makes user state easily accessible; this state information includes application and session state, data stored in ViewState, and data stored in control state, which is new in ASP.NET 2.0 and later. In general, an HttpHandler can be either synchronous or asynchronous. As you would guess, a synchronous handler does not return data until it finishes processing the HTTP request for which it is called. An asynchronous handler returns data immediately and is usually tasked with launching a process that can be lengthy. As mentioned previously, HttpHandlers have a

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Finally, after passing through all the modules in the HTTP pipeline, ASPNET actually executes the requested page During execution, the page may access various resources, such as files, a database, or enterprise services Code execution runs under the security context of the thread, so any external resource requests are made using the thread s security context This can make for some interesting situations when using Windows Authentication Remember, the file authorization module uses the access token from IIS to check NTFS permissions on the requested resource and only the requested resource If the requested resource is an ASPNET page, that page may attempt to access other resources At that point, access to files is governed by the access token associated with the thread, not the access token from IIS Here s a situation in which this could be an issue.

Without a doubt, the Wizard control s greatest strength is the way it lets you customize its appearance. This means that if you want the basic model (a multistep process with navigation buttons and various events), you aren t locked into the default user interface. Depending on how radically you want to change the wizard, you have different options. For less dramatic modifications, you can set various top-level properties. For example, you can control the colors, fonts, spacing, and border style, as you can with any ASP.NET control. You can also tweak the appearance of every button. For example, to change the Next button, you can use the following properties: StepNextButtonType (use a button, link, or clickable image), StepNextButtonText (customize the text for a button or link), StepNextButtonImageUrl (set the image for an image button), and StepNextButtonStyle (use a style from a stylesheet). You can also add a header using the HeaderText property. More control is available through styles. You can use styles to apply formatting options to various portions of the Wizard control just as you can use styles to format different parts of rich data controls such as the GridView. Table 16-4 lists all the styles you can use. As with other style-based controls, more specific style settings (such as SideBarStyle) override more general style settings (such as ControlStyle) when they conflict. Similarly, StartNextButtonStyle overrides NavigationButtonStyle on the first step.

ControlStyle HeaderStyle SideBarStyle SideBarButtonStyle StepStyle NavigationStyle NavigationButtonStyle StartNextButtonStyle StepNextButtonStyle StepPreviousButtonStyle FinishPreviousButtonStyle CancelButtonStyle

Let s say that your application is configured to use Windows Authentication without impersonation, and a user access an ASPNET page in that application, logging in as Joe Bloggs The file authorization module checks the NTFS permissions on the requested resource using the Joe Bloggs security context and allows access to the file ASPNET then begins executing the page code Code inside the page then attempts to read from a file to which the Joe Bloggs security context is denied access according to NTFS permissions But the file is accessed using the ASPNET/Network Service security context and this allows the file to be read The contents of the file are then displayed to Joe Bloggs even though Joe Bloggs is explicitly denied access to the file Of course, you can also use this behavior to your benefit.

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