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Cookies are not the only way of putting Forms authentication to work. ASP.NET can offer an alternative API that exposes a nearly identical programming interface but makes no use of cookies. When cookieless authentication is on, the ticket it is incorporated into the URL in much the same way as for cookieless sessions. The URL of the page served to an authenticated user follows the pattern shown here:

MustInherit Class Shape ... (Other members as in previous example) ... MustOverride Sub Display() End Class

The ticket, properly encoded to a URL-compliant alphabet, is inserted in the URL right after the server name. Note No matter which settings you might have for validation and encryption, or whether your

If a class has one or more virtual methods, the class itself is virtual and must be marked with the MustInherit keyword. The following Square class inherits from Shape and overrides the Display method:

authentication scheme is cookied or cookieless, the information stored in the authentication ticket is encoded so that it is not immediately human-readable. Forms authentication uses a URI-safe derivative of the Base64 encoding that carries six bits of encoding per character.

Cookieless authentication requires an ISAPI filter to intercept the request, extract the ticket, and rewrite the correct path to the application. The filter also exposes the authentication ticket as another request header. The same aspnet_filter.dll component that we saw in 17, ASP.NET State Management, for cookieless sessions is used to parse the URL when cookieless authentication is used. To avoid confusion, each extra piece of information stuffed in the URL is wrapped by unique delimiters: S(...) for a session ID and F(...) for an authentication ticket. The filter extracts the information, removes URL adornments, and places the ticket information in a header named AspAuthenticationTicket.

Class Square Inherits Shape Public Side As Single Overrides Sub Display() Add here the statements that draw the square. End Sub End Class

To enable cookieless authentication, you set the cookieless attribute in the <forms> section of the configuration file to a particular value. The attribute specifies if and how cookies are used to store the authentication ticket. It can take any of the values listed in Table 19-7.

Visual Basic .NET accepts five scope qualifiers, which are the three qualifiers available to Visual Basic 6 developers (Public, Friend, and Private), plus two new ones (Protected and Protected Friend). These new qualifiers are related to inheritance, which explains why I deferred their description until now. Before diving into a thorough discussion of scope, though, you must learn about one more Visual Basic .NET feature: nested classes.

TABLE 19-7

Click the Execution link. Click the Cache A Temporary Copy Of The Report. Expire Copy Of Report After A Number Of Minutes option to cache the report and expire after a specified number of minutes. Change the number of minutes to 60. Your screen looks like this:

Unlike previous versions of the language, Visual Basic .NET lets you nest class definitions:

Uses cookies if the browser has cookie support currently enabled. It uses the cookieless mechanism otherwise. Always uses cookies, regardless of the browser capabilities. Uses cookies if the browser supports them, and uses the cookieless mechanism otherwise. When this option is used, no attempt is made to check whether cookie support is really enabled for the requesting device. This is the default option. Never uses cookies, regardless of the browser capabilities.

5:

There s a subtle difference between UseDeviceProfile and AutoDetect. Let s make it clear with an example. Imagine a user making a request through Internet Explorer. The browser does have support for cookies as reported in the browser capabilities database installed with ASP.NET. However, a particular user might have disabled cookies support for her own browser. AutoDetect can correctly handle the latter scenario, and it will opt for cookieless authentication. UseDeviceProfile doesn t probe for cookies being enabled, and it stops at what s reported by the capabilities database. It will incorrectly opt for cookied authentication, causing an exception to be thrown. The default value for the cookieless attribute is UseDeviceProfile. You should consider changing it to AutoDetect. Note When assigning a value to the cookieless attribute in the <forms> section, pay attention