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Before you can run any data access code, you need a database server to take your command. Although there are dozens of good options, all of which work equally well with ADO.NET (and require essentially the same code), a significant majority of ASP.NET applications use Microsoft SQL Server. This chapter includes code that works with SQL Server 7 or later, although you can easily adapt the code to work with other database products. If you don t have a full version of SQL Server, there s no need to worry you can use the free SQL Server Express (as described in the next section). It includes all the database features you need to develop and test a web application.

Note You can also search for nodes using the methods of the current SiteMapProvider object, which is available through the SiteMap.Provider shared property. For example, the SiteMap.Provider.FindSiteMapNode() method allows you to search for a node by its URL.

databases, which are sample databases included with some versions of Microsoft SQL Server. These databases aren t preinstalled in modern versions of SQL Server. However, you can easily install them using the scripts provided with the online samples. See the readme.txt file for full instructions, or refer to the section named The sqlcmd Command-Line Tool later in this chapter.

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Returns the node one level up in the navigation hierarchy, which contains the current node. On the root node, this returns a null reference. Provides a collection of all the child nodes. You can check the HasChildNodes property to determine whether child nodes exist. Returns the previous node that s at the same level (or a null reference if no such node exists). Returns the next node that s at the same level (or a null reference if no such node exists).

Factories are any class that contains a method whose primary purpose is to create another object. Factories are critically important to the practice of polymorphic programming. They allow you to substitute classes, change configuration on the fly, and generally make your application more nimble. The successful mastery of the factory pattern is important for any advanced PHP developer. The factory pattern is typically used to return different classes that conform to a similar interface. A common use for factories is to create a polymorphic provider, allowing you to

If you don t have a test database server handy, you may want to use SQL Server 2005 Express Edition, the free data engine included with some versions of Visual Studio and downloadable separately. SQL Server Express is a scaled-down version of SQL Server that s free to distribute. SQL Server Express has certain limitations for example, it can use only one CPU and a maximum of 1GB of RAM, and databases can t be larger than 10GB. However, it s still remarkably powerful and suitable for many midscale websites. Even better, you can easily upgrade from SQL Server Express to a paid version of SQL Server if you need more features later. For a comparison between SQL Server Express and other editions of SQL Server, refer to http://www.microsoft.com/sqlserver/2008/en/us/editions.aspx. SQL Server Express is included with the Visual Studio installation, but if you need to download it separately or you want to download the free graphical management tools that work with it, go to http://www.microsoft.com/express/database.

To see this in action, consider the following code, which configures two labels on a page to show the heading and description information retrieved from the current node: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load lblHead.Text = SiteMap.CurrentNode.Title lblDescription.Text = SiteMap.CurrentNode.Description End Sub If you re using master pages, you could place this code in the code-behind for your master page, so that every page is assigned its title from the site map. The next example is a little more ambitious. It implements a Previous/Next set of links, allowing the user to traverse an entire set of subnodes. The code checks for the existence of sibling nodes, and if there aren t any in the required position, it simply hides the links:

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