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You can execute these scripts by either using osql.exe or using sqlcmd.exe. osql.exe is included with SQL Server 2000 editions, and sqlcmd.exe is included with SQL Server 2005 editions for executing scripts from the command line. For example, to install the common database tables on a SQL Server Express Edition, you can execute the following command: sqlcmd -S (local)\SQLExpress -E -i InstallCommon.sql The -S switch specifies the server and instance name for the target SQL Server. Usually you will not use an instance name (which is specified after the \), but SQL Server Express Edition will be installed as a named instance so that you can install more versions and instances of SQL Server on the same machine. Therefore, for SQL Server Express Edition, you have to specify the instance name, which is SQLExpress by default. With the -E switch you specify to access SQL Server through Windows authentication, and finally through the -i switch you can specify the input SQL script that should be executed. Figure 21-7 shows the result of executing the previous command.

As mentioned earlier, you do not need to restrict access to pages in order to use authentication. It is possible to use authentication purely for personalization so that anonymous users view the same pages as authenticated users (but see slightly different, personalized content). However, to demonstrate the redirection functionality of forms authentication, it s useful to create an example that denies access to anonymous users. This will force ASP.NET to redirect anonymous users to the login page. 23 describes authorization in detail. For now, you ll use the simple technique of denying access to all unauthenticated users. To do this, you must use the <authorization> element of the web.config file to add a new authorization rule, as shown here: <configuration> <system.web> <!-- Other settings omitted. --> <authorization> <deny users=" " /> </authorization> </system.web> </configuration> The question mark ( ) is a wildcard character that matches all anonymous users. By including this rule in your web.config file, you specify that anonymous users are not allowed. Every user must be authenticated, and every user request will require the forms authentication ticket (which is a cookie). If you request a page in the application directory now, ASP.NET will detect that the request isn t authenticated and attempt to redirect the request to the login page (which will probably cause an error, unless you ve already created this page).

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The AuthenticateRequest event is raised by the HttpApplication object when a request requires authentication. Once the user is authenticated (typically supplying some sort of user credential such as a cookie with user information), the next step is to make sure the user identity information is readily available for the rest of the page-processing cycle. To accomplish this, you must create a new object with user information and attach it to the User property of the current HttpContext. The AuthorizeRequest event is raised after the user has been authenticated in the AuthenticateRequest event. Authorization modules use AuthorizeRequest to check whether the user is authorized for the resource they are requesting.

If you want to accomplish a certain UI effect, you might handle rapid events such as mouse movements with client-side JavaScript. (Or, better yet, you might use a custom ASP.NET control that already has these smarts built in, like some sort of pop-up menu.) However, all your business code must execute in the secure, feature-rich server environment.

Unlike the <authentication> element, the <authorization> element is not limited to the web.config file in the root of the web application. Instead, you can use it in any subdirectory, thereby allowing you to set different authorization settings for different groups of pages. You ll learn much more about authorization in 23.

Authentication is implemented in ASP.NET through specialized HTTP modules, as demonstrated in Figures 19-9 and 19-10. You choose which authentication module you want to use with the <authentication> element in the web.config configuration file. All authentication modules implement the IHttpModule interface, which provides access to application events (as explained in 5). This allows them to handle the HttpApplication.AuthenticateRequest event. Each module also exposes its own Authenticate event that you can handle in the global.asax file.

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