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As you can see, the control text is clearly visible (along with some unprintable characters that render as blank boxes). This means that, in its default implementation, view state isn t a good place to store sensitive information that the client shouldn t be allowed to see that sort of data should stay on the server. Additionally, you shouldn t make decisions based on view state that could compromise your application if the client tampers with the view state data. Fortunately, it s possible to tighten up view state security quite a bit. You can enable automatic hash codes to prevent view state tampering, and you can even encrypt view state to prevent it from being decoded. These techniques raise hidden fields from a clumsy workaround to a much more robust and respectable piece of infrastructure. You ll learn about both of these techniques in 6.

If you ve programmed with ASP.NET 1.x, you may have noticed that the view state serialization model in ASP.NET 2.0 isn t exactly the same. Instead of separating values with semicolons and angle brackets, ASP.NET 2.0 uses nonprintable characters, which makes parsing the string more efficient (because it s easier to distinguish the serialized data from the markers) and more compact. ASP.NET 2.0 also reduces the serialization size for many common data types, including Boolean values, integers, and strings that are repeated more than once (which is fairly common, because different controls often have the same property names). These seemingly minor changes can have a dramatic effect. Depending on the number of delimiters in the serialized view state, and the types of data types that are used, a data-heavy control can shrink its view state by half or more.

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As much as there is to learn about accessing the protocols for these various types of backends, putting them to good use requires a good deal of imagination. There s only so much a book like this can say about how and why to access or replace these lower-level interfaces, so it s up to you to determine what s best for your environment and your applications. While this chapter discussed how to use and overhaul major portions of Django s infrastructure, sometimes all that s needed is a simple utility to replace or avoid a lot of redundant code. It s important to know the difference, and the next chapter will outline the many basic utilities provided in Django s core distribution.

The LoginStatus control is a simple control that displays either a login link if the user is not authenticated or a logout link if the user is authenticated. The login link automatically redirects to the configured login page, and the logout link automatically calls the method FormsAuthentication.SignOut for logging off the user. The control is fairly simple, and therefore customization is simple as well. <asp:LoginStatus ID="LoginStatus1" runat="server" LoginText="Sign In" LogoutText="Sign Out" LogoutPageUrl="~/Default.aspx" LogoutAction="Redirect" /> The LoginStatus control offers a couple of properties for customizing the text shown for the links and the URLs to redirect to when the user clicks the link. You can find the most important properties in Table 21-10. Table 21-10. Properties for Customizing the LoginStatus Control

The text displayed if the user is not signed in. A URL for an image displayed as an icon for the login link. The text displayed if the user is authenticated. A URL for an image displayed as icon for the logout link. Configures the action the control performs if the user clicks the logout link that is displayed when the user is authenticated. Valid options are Refresh, Redirect, and RedirectToLoginPage. The first option just refreshes the current page, the second option redirects to the page configured in the LogoutPageUrl, and the last option redirects to the login page. A page to redirect to if the user clicks the logout link and the LogoutAction is set to Redirect.

This control is fairly simple but extremely powerful. It allows you to display a different set of controls for anonymous and authenticated users. Further, it even allows you display different content

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