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We mentioned previously that the HttpApplication class makes user state available to the developer in the Context property of the HttpContext type. The HttpContext class implements HttpSessionState and HttpApplicationState instances to provide server-side state management. In this section, we cover these classes in detail, because they are important features of the ASP.NET request-processing engine, as they provide server-side state mechanisms to web applications. Table 3-2 contains a partial description of some of the important properties attached to the HttpContext class and what capabilities they provide. Refer to the .NET Framework documentation for more detailed information on the HttpContext class.

Now that you understand the overall security architecture of ASP.NET, let s look at configuration examples.

Command (Hot Key)

Step Into (F11)

Your application s first line of defense is a proper security configuration. IIS, ASP.NET, and system resources all expose configuration options allowing you to tweak security settings to suit your needs, you just need to know how and when to use them. This section guides you through those decisions, showing you practical configuration settings and the scenarios in which you should use them.

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Provides server-side state management for all clients of the web application Reference controls the execution process of the ASP.NET web request Provides access to the server-side cache in ASP.NET Provides access to the error exceptions that occur during ASP.NET execution Key/value pair collection used to pass information between the components in a request Contains information from the client request, including browser type, cookies, and values encoded in form and URL query string collections Key/value pair collection used to pass information between the requesting components Provides utilities including Server.Transfer, Server.HtmlEncode, and Server.MapPath

Executes the currently highlighted line and then pauses. If the currently highlighted line calls a procedure, execution will pause at the first executable line inside the method or function (which is why this feature is called stepping into). The same as Step Into, except that it runs procedures as though they are a single line. If you select the Step Over command while a procedure call is highlighted, the entire procedure will be executed. Execution will pause at the next executable statement in the current procedure. Executes all the code in the current procedure and then pauses at the statement that immediately follows the one that called this method or function. In other words, this allows you to step out of the current procedure in one large jump. Resumes the program and continues to run it normally without pausing until another breakpoint is reached. Allows you to run all the code up to a specific line (where your cursor is currently positioned). You can use this technique to skip a timeconsuming loop. Allows you to change your program s path of execution while debugging. It causes your program to mark the current line (where your cursor is positioned) as the current line for execution. When you resume execution, this line will be executed, and the program will continue from that point. Moves focus to the line of code that is marked for execution. This line is marked by a yellow arrow. The Show Next Statement command is useful if you lose your place while editing.

Step Over (F10)

IIS allows you to configure authentication, IP and domain restrictions, application mappings, and secure communications on an application-by-application basis. This gives you a great deal of flexibility when deploying multiple applications because you can custom-tailor the server security for each individual application. Most of the security settings in IIS are available from the Directory Security tab in the application properties dialog box. You can view the application properties by clicking on the Internet Information Services icon in the Administrative Tools folder in the Control Panel. Expand the navigation tree until you locate the folder that contains the application whose properties you want to view. Right-click on the folder and select the Properties option from the context menu. This opens the properties window. Select the Directory Security tab from the tabs shown at the top of the window. Figure 12-9 shows the IIS window, expanded folders listing, and the properties window for the 12 application.

Step Out (Shift+F11)

State collection maintained on behalf of a web application user Debugging utility for writing to the trace output of the web form Makes security information available when a user is authenticated

You can switch your program into break mode at any point by clicking the pause button in the toolbar or by selecting Debug Break All.

Figure 12-9. IIS management console and the 12 Security Application Properties (Directory Security tab shown)

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