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Most of the time, when building web applications, developers need to store state information that shouldn t be exposed to the user, such as application-specific logic to aid in processing a request Hidden input fields give developers the ability to store additional information as part of the web form without making the data directly visible to the user The <input type="hidden"> tag can carry the additional state information as part of the <form> tag inside an HTML document: <form id="writing" method="post" action="writingaspx"> <input id="names" value="Dale Michalk Rob Cameron"> <input id="task" value="write book"> <input id="SessionNumber" type="hidden" value="234234222"> <input id="progress" type="hidden" value="50%"> </form> Naturally, the hidden form fields can be accessed in server-side code in the same way as the text form fields were previously, by using either the RequestForm or RequestParams collection.

ASP .NET actually defines three navigation controls: the TreeView, Menu, and SiteMapPath. The SiteMapPath provides breadcrumb navigation, which means it shows the user s current location and allows the user to navigate back up the hierarchy to a higher level using links. Figure 16-10 shows an example with a SiteMapPath control when the user is on the Software.aspx page. Using the SiteMapPath control, the user can return to the Products.aspx page or the Home.aspx page.

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Using Basic Authentication with SSL provides a very secure and widely supported authentication mechanism Basic Authentication is a good option when compatibility is an issue because most browsers do support Basic Authentication Basic Authentication also supports delegation, so it s useful in scenarios where you need to use delegation to access certain network resources You should always be aware that Basic Authentication is inherently insecure and strive to secure the communication line between the browser and the server when using it Digest Authentication Digest Authentication is a challenge/response authentication mechanism designed to avoid the obvious problems with sending a clear-text password over a network It s a more recent authentication mechanism than Basic Authentication, so some browsers may not support it.

Figure 16-10. Breadcrumb navigation with SiteMapPath Here s how you define the SiteMapPath control: <asp:SiteMapPath ID="SiteMapPath1" runat="server" /> The SiteMapPath control is useful both for an at-a-glance view that provides the current position and for a way to move up the hierarchy. However, you always need to combine it with other navigation controls that let the user move down the site map hierarchy. The SiteMapPath control is also thoroughly customizable. Table 16-6 lists some of its most commonly configured properties. Table 16-6. SiteMapPath Appearance-Related Properties

Set this to false if you don t want the description text to appear when the user hovers over a part of the site map path. Sets the maximum number of parent levels that will be shown at once. By default, this setting is -1, which means all levels will be shown. If true, the portion of the page that indicates the current page is turned into a clickable link. By default, this is false because the user is already at the current page. You have two choices: RootToCurrent (the default) and CurrentToRoot (which reverses the order of levels in the path). Indicates the characters that will be placed between each level in the path. The default is the greater-than (>) symbol. Another common path separator is the colon (:).

Hidden form variables do have some potential drawbacks: As with URL query string variables, programmers must manually track changes to hidden variables and emit values each time a page is rendered in order to maintain the user s state within the application Although hidden fields are not immediately visible to the user, selecting View Source in the browser enables the user to see what information is available in hidden fields In most cases, this may not be an issue, but it is important to be cognizant of this and either refrain from storing sensitive data or manually add an additional processing layer of encryption to prevent exposure Storing a large amount of data in hidden variables can become a performance issue, depending on the amount of network bandwidth and processing available Like the previous drawback, developers can manually add an additional processing layer that implements compression to minimize data size.

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