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On the other hand, a control doesn t have absolute power if it calls Page.RegisterRequiresViewStateEncryption() and the encryption mode is Never, the view state won t be encrypted. When hashing or encrypting data, ASP.NET uses the computer-specific key defined in the <machineKey> section of the machine.config file, which is described in 5. By default, you won t actually see the definition for the <machineKey> because it s initialized programmatically. However, you can see the equivalent content in the machine.config.comments files, and you can explicitly add the <machineKey> element if you want to customize its settings.

NET, which retrieves the name gathered from the NameTextBox control on the ClientStateaspx web form and pushes it out to the client-state mechanisms we are interested in testing The page that renders after the server-side execution of Set State is complete contains the client state for the name entered into the NameTextBox control The URL has the name embedded as part of the query string If you click the link, it will force a read of the query string state, which allows the URL field at the bottom of the page a chance to show the value through this state mechanism The web form has two hidden variables; one is populated with ViewState and used to hold the name entered by the user in the web form, as a developer would code using just hidden input tags To see this, select View Source in the browser.

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Click the Add button to display the Add/Edit Application Extension Mapping dialog box (shown in Figure 12-17). To add a mapping to ASP.NET, click the Browse button and locate aspnet_isapi.dll. It is usually located in C:\Windows\Microsoft.NET\Framework\<version>\aspnet_isapi.dll You may then specify the extension of the file type you want to map to ASP.NET in the Extension text box. The Verbs section allows you to specify the HTTP verbs for which the ISAPI mapping is valid. Unless you have a compelling reason to do otherwise, use the default All Verbs option. Leave the Script engine check box in its default, checked state. It deals with execution permissions for the .DLL. The Check that file exists check box determines whether IIS will check the file system for the requested file before handing the request off to the ISAPI extension. This is helpful for virtual files that you want to generate using code but that don t actually exist on the file system. When you have entered the appropriate information, click on the OK button. You ll see your new mapping appear in the listing on the Mappings tab. Figure 12-17 shows the Add/Edit Application Extension Mapping dialog box.

Don t encrypt view state data if you don t need to do so. The encryption will impose a performance penalty, because the web server needs to perform the encryption and decryption with each postback.

One of the most significant limitations with view state is that it s tightly bound to a specific page. If the user navigates to another page, this information is lost. This problem has several solutions, and the best approach depends on your requirements.

IIS supports the HTTPS protocol for encrypting communicating between IIS and the browser. It requires a valid server certificate, which can be obtained from a certificate authority such as VeriSign. A complete discussion of certificate management and network security is beyond the scope of this book, but know that this is the area where you may enable it.

One common approach is to pass information using a query string in the URL You will commonly find this approach in search engines For example, if you perform a search on the Google website, you ll be redirected to a new URL that incorporates your search parameters Here s an example: http://wwwgoogleca/search q=organic+gardening The query string is the portion of the URL after the question mark In this case, it defines a single variable named ask, which contains the organic+gardening string The advantage of the query string is that it s lightweight and doesn t exert any kind of burden on the server Unlike cross-page posting, the query string can easily transport the same information from page to page It has some limitations, however: Information is limited to simple strings, which must contain URL-legal characters.

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