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You can do this by right-clicking Web Application Folder (or the folder for the virtual directory in your setup project) and selecting Add Project Output Afterward, you need to select the project content that should be added to the selected destination folder in a separate dialog box, as shown in Figure 18-38..

As mentioned previously, you might want to use encryption in a web application for two reasons: To protect communication (data over the wire): For example, you might want to make sure an eavesdropper on the public Internet can t read a credit card number that s used to purchase an item on your e-commerce site The industry-standard approach to this problem is to use SSL SSL also implements digital signatures for ensuring integrity SSL isn t implemented by ASP NET Instead, it s a feature provided by IIS Your web-page (or web service) code is identical whether or not SSL is used To protect permanent information (data in a database or in a file): For example, you might want to store a user credit card in a database record for future use.

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Caution Using impersonation is tricky (if not dangerous). It requires you to properly configure ACL entries on every object for every group, or sometimes even every user. A simple configuration mistake can lead to a security hole in your application. When the number of users (and Windows groups) grows, the situation gets more and more complex, and therefore configuration errors may happen. You shouldn t use impersonation if it s not really necessary. You should always prefer to create custom application roles and perform authorization based on these roles.

Figure 18-38 shows two states of the dialog box; the first one has a Visual Studio 2005 website project selected, and the second one has a web deployment project selected in the Project dropdown list. The Project drop-down list shows all the available projects of the current solution. Typically, you need to add project outputs from the website project for which you are creating the setup project as well as the project output from all the referenced class libraries required for running your website. For a standard website project, you add all the content files of the website project, and for a web deployment project, you add the precompiled output of the project to the destination directory. As soon as you have added the contents for your website project and all the referenced class libraries, you can build the web setup project. The output will be an MSI package that installs the website project on the destination server. This means it creates the directory structures, creates the specified registry entries, and registers an IIS directory for each web custom folder specified in the file system view of your web setup project. Figure 18-39 shows Visual Studio 2005 after building the web setup project. Web setup projects are built only if you right-click them and select Rebuild. They are, by default, excluded from the regular build of a Visual Studio solution because building MSI packages requires more time than building normal projects such as class libraries or websites (you can add them to the regular build via the solution s properties).

Although you could store this data in plain text and assume the web server won t be compromised, this is never a good idea Instead, you should use the encryption classes that are provided with NET to manually encrypt data before you store it It s worth noting that the NET encryption classes aren t directly tied to ASPNET In fact, you can use them in any type of NET application You ll learn about encryption and digital signatures as well as how to take control of custom encryption in 25..

Furthermore, you can implement authorization by writing custom code in your pages or components used by the web application. In that case, you refer to the HttpContext.Current.User object and make decisions based on role membership or the user s name directly. You will learn more about how to design and implement authorization in 23. But before learning about the details of authentication and authorization, you must understand the meaning of the security context.

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