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Figure 12-14. Authentication Methods property window If your application uses Windows Authentication, you can still enable anonymous access, but you may have to do a bit more work specifying NTFS file permissions for anonymous users. Windows Authentication causes the file authorization module to become active, so you need to create NTFS permission entries to allow read access for the anonymous user account. If your application is using Windows Authentication and you re not planning to allow anonymous users to access the application, then you should disable anonymous access. Anonymous access isn t really a type of authentication as much as it is a lack of authentication. Thus, all browsers should support anonymous access so you should never have compatibility issues between browsers when using it. Basic Authentication You can enable Basic Authentication in IIS by selecting the Basic authentication check box in the Authenticated access section of the Authentication Methods dialog box (refer to Figure 12-14). You can also specify a default domain and a realm for basic authentication. By default, IIS authenticates credentials against the domain to which the server belongs. If you want IIS to authenticate users against a different domain, specify the domain in the Default domain text box. The Realm text box allows you to specify text to display to the user when the browser requests credentials; it is informational in nature and does not change the authentication behavior in any way.

In this example, the Products and Services nodes have URLs, which means they are clickable (and take the user to specific pages). However, if you simply want to use these nodes as categories to arrange other links, just omit the url attribute. You ll still see the node in your bound controls; it just won t be rendered as a link.

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The server control representing the form tag emits the following HTML output: <form id="first" method="post" action="first.aspx"> Notice that the tag is tied to the HTTP POST protocol and has an action attribute to submit the page back to the original URL of the web page. Ensuring that all emitted form variables, hidden or not, can be read upon form submission is a key requirement. Here s the complete form output for our simple example: <form id="first" method="post" action="first.aspx"> <input id="names" type="text" value="Dale Michalk Rob Cameron"> <input id="task" type="text" value="write book"> </form> Once the web form is submitted via a button click or a JavaScript submission of the form, ASP.NET parses the input values to allow web form and control code to extract the values and drive the logic of the web application. The variables in an HTTP POST are encoded using HTML encoding rules and are separated in the body of the request via ampersand characters: names=dale+michalk+rob+cameron&task=writebook ASP.NET provides the Form or Params collections attached to the HttpRequest class in the current HttpContext to read the values: string names = Request.Form["names"]; string task = Request.Params["task"]; As you can see, form data is made available on the server through the construct of the ASP.NET postback mechanism and the HttpContext object. Figure 3-3 shows the ASP.NET postback mechanism.

Once you ve defined the Web.sitemap file, you re ready to use it in a page. This is a great place to use master pages so that you can define the navigation controls as part of a template and reuse them with every page. Here s how you might define a basic structure in your master page that puts navigation controls on the left: <form id="form1" runat="server"> <table> <tr> <td style="width: 226px;vertical-align: top;"> <!-- Navigation controls go here. --> </td> <td style="vertical-align: top;"> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server" /> </td> </tr> </table> <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" /> </form> Then, create a child with some simple static content: <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"> <br /> <br /> Default.aspx page (home). </asp:Content> The only remaining task is to choose the controls you want to use to display the site map data. One all-purpose solution is the TreeView control. You can add the TreeView and bind it to the SiteMapDataSource in the master page using the DataSourceID, as shown here: <asp:TreeView ID="treeNav" runat="server" DataSourceID="SiteMapDataSource1" /> Alternatively, you could use the fly-out Menu control just as easily: <asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1" />

Basic Authentication was defined in HTML 10, so it has been around for a while and is the most widely supported form of authentication Users are prompted for their credentials (a username and password), and those credentials are then encoded into a base64 string and sent back to IIS where they can be authenticated The biggest issue with Basic Authentication is that the username and password are sent over what amounts to clear text Encoding and decoding a base64 string is very simple, so anyone with a network scanner can easily capture the encoded string, decode it, and determine someone s username and password So, Basic Authentication isn t a secure form of authentication in and of itself There is, of course, a caveat to that Secure Sockets Layer (SSL) can encrypt all communications between a browser and IIS, including the base64 encoded string used in Basic Authentication.

Figure 16-9. TreeView and Menu navigation You can do a lot more to customize the appearance of your navigation controls and the processing of your site map. You ll consider these more advanced topics in the following sections.

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