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The starting point in site map based navigation is the site map provider. ASP .NET ships with a single site map provider, named XmlSiteMapProvider, which is able to retrieve site map information from an XML file. If you want to retrieve a site map from another location or in a custom format, you ll need to create your own site map provider a topic covered in the section Creating a Custom SiteMapProvider. The XmlSiteMapProvider looks for a file named Web.sitemap in the root of the virtual directory. Like all site map providers, its task is to extract the site map data and create the corresponding SiteMap object. This SiteMap object is then made available to other controls through the SiteMapDataSource. To try this, you need to begin by creating a Web.sitemap file and defining the website structure using the <siteMap> and <siteMapNode> elements. <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"> <siteMapNode> <siteMapNode>...</siteMapNode> <siteMapNode>...</siteMapNode> ... </siteMapNode> </siteMap> To be valid, your site map must begin with the root <siteMap> node, followed by a single <siteMapNode> element, representing the default home page. You can nest other <siteMapNode> elements in the root <siteMapNode> as many layers deep as you want. Each site map node should have a title, description, and URL, as shown here: <siteMapNode title="Home" description="Home" url="~/default.aspx"> In this example, the URL uses the new ~/ syntax, which indicates the root of the web application. This style isn t necessary, but it is strongly recommended, as it ensures that your site map links are interpreted correctly regardless of the current folder. You can now use the <siteMapNode> to create a site map. The only other restriction is that you can t create two site map nodes with the same URL.

The restriction to avoid duplicate URLs is not baked into the navigation system. It s simply required by the XmlSiteMapProvider, because the XmlSiteMapProvider uses the URL as a unique key. If you create your own site map provider or use a third-party provider, you may allow different URLs and require separate key information. However, you can t get around the rule that every site must begin with one root node, because that s implemented in the base SiteMapProvider class. (As you ll see shortly, you still have options for tailoring the display of the site map tree, but you must start with a single home node.)

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Hidden input variables inside an HTML form are the third method of client-side state management available in ASP.NET that we discuss in this section. This technique is familiar to many developers who created web applications with technologies such as Common Gateway Interface (CGI) and ASP. Unlike the URL string and cookie options, size limitations and device support issues are not pressing concerns, so hidden input variables as part of an HTML form are a heavily used technique for client-side state management. For data stored in an HTML form to be available, the use of the HTTP POST mechanism is required to transmit the state information back to the web server. ASP.NET helps ensure this through the System.Web.UI.HtmlControls.HtmlInputForm server control. HtmlInputForm is smart enough to render a method="post" attribute, along with an action attribute that directs the page back to the original URL. The following tag on a hypothetical web form named first.aspx is rendered as a server control because of the runat="server" attribute: <form id="first" method="post" runat="server">

The whole point of Forms Authentication is that IIS allows requests to pass through anonymously and lets ASPNET authenticate those incoming requests using tickets You should also enable anonymous access when your application is configured using the None authentication option..

Here s a sample site map: <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"> <siteMapNode title="Home" description="Home" url="~/default.aspx"> <siteMapNode title="Products" description="Our products" url="~/Products.aspx"> <siteMapNode title="Hardware" description="Hardware choices" url="~/Hardware.aspx" /> <siteMapNode title="Software" description="Software choices" url="~/Software.aspx" /> </siteMapNode> <siteMapNode title="Services" description="Services we offer"

url="~/Services.aspx"> <siteMapNode title="Training" description="Training classes" url="~/Training.aspx" /> <siteMapNode title="Consulting" description="Consulting services" url="~/Consulting.aspx" /> <siteMapNode title="Support" description="Support plans" url="~/Support.aspx" /> </siteMapNode> </siteMapNode> </siteMap>

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