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In ASP.NET 2.0 and later, ViewState is greatly improved compared to .NET Framework 1.1 or earlier by a reduction in encoding size, which reduces the size of pages with ViewState enabled. Also, ViewState in ASP.NET 2.0 and later does a much better job of integrating with data controls like GridView by intelligently using ViewState when data controls are bound to declarative data source controls meaning, if ViewState is enabled, ASP.NET 2.0 and later will not go back to the database to get data. However, if ViewState is disabled, ASP.NET 2.0 and later will automatically go back and bind to the data source. This functionality is building into the DataBoundControl base class. Another improvement in ASP.NET 2.0 and later is control state, which allows a control to store important control-related data items required for proper function even if ViewState is disabled. We cover control state in more detail later in this chapter.

You can enable Integrated Windows Authentication in IIS by selecting the Integrated Windows authentication check box at the bottom of the Authentication methods dialog box The biggest problem with Integrated Windows Authentication is that it is a Microsoftspecific authentication mechanism designed to work in Internet Explorer, making browser compatibility questionable Firefox supports Integrated Windows Authentication, but it displays a dialog box to the user instead of attempting automatic authentication Other browsers, such as Opera, simply display a message stating that the authentication type isn t supported You should not use this authentication method if you need to support a variety of browsers Integrated Windows Authentication is actually made up of two different authentication mechanisms, Kerberos and NT LAN Manager (NTLM) By default, Windows 2000 and 2003 servers attempt to use Kerberos Authentication, but fall back on NTLM if the accounts involved are not properly configured.

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This way, you ll show only the pages under the Dealer Home branch of the site map You can even make your life easier by breaking a single site map into separate files using the siteMapFile attribute, like this: <siteMap xmlns="http://schemasmicrosoftcom/AspNet/SiteMap-File-10" > <siteMapNode title="Root" description="Root" url="~/"> <siteMapNode siteMapFile="Dealerssitemap" /> <siteMapNode siteMapFile="Employeessitemap" /> </siteMapNode> </siteMap> Even with this technique, you re still limited to a single site map tree, and it always starts with the Websitemap file However, you can manage your site map more easily because you can factor some of its content into separate files..

This technique is greatly limited because the XmlSiteMapProvider doesn t allow duplicate URLs. That means there s no way to reuse the same page in more than one branch of a site map. Although you can try to work around this problem by creating different URLs that are equivalent (for example, by adding extra query string parameters on the end), this raises more headaches. If these limitations won t work in your scenario, the best approach is to design your own site map provider.

IIS on Windows XP uses NTLM because Kerberos is dependent on Active Directory Kerberos Authentication may be delegated, but NTLM cannot be delegated, so delegation is highly dependent on configuration Unfortunately, configuring accounts to use Kerberos Authentication in Active Directory domain controllers is beyond the scope of this book Another notable issue is that Integrated Windows Authentication may not work through a firewall when used over a proxy unless sent over a Virtual Private Network (VPN) using Microsoft s Point-to-Point Tunneling Protocol (PPTP) Integrated Windows Authentication is the preferred authentication type for internal intranet applications where client and servers have access to the same Active Directory, and it can be reasonably assumed that everyone accessing the system uses Internet Explorer It isn t intended for public-facing websites Mixing Authentication Methods You re not limited to using a single authentication or access method.

The client-side state management technique ViewState exists in the .NET Framework class hierarchy as a member property of the System.Web.UI.Control class called ViewState, of type StateBag, which implements a dictionary data structure to store name/value pairs. The StateBag class implements the interfaces in Table 3-3.

The SiteMapDataSource.StartingNodeOffset property takes the most getting used to. It takes an integer that instructs the SiteMapDataSource to move that many levels down the tree (if the number

is positive) or up the tree (if the number is negative) The important detail that s often misunderstood is that when the SiteMapDataSource moves down the tree, it moves toward the current node If it s already at the current node, or your offset takes it beyond the current node, the SiteMapDataSource won t know where to go, and you ll end up with a blank navigation control To understand how this works, it helps to consider an example.

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