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You can also create a custom SiteMapProvider that returns instances of a custom SiteMapNode-derived class. However, a significant amount of extra code is required, and as a result it s often not worth the trouble.

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>

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Connections are a limited server resource. This means it s imperative to open the connection as late as possible and release it as quickly as possible. In the previous code sample, an exception handler makes sure that even if an unhandled error occurs, the connection will be closed in the finally block. If you don t use this design and an unhandled exception occurs, the connection will remain open until the garbage collector disposes the SqlConnection object. An alternate approach is to wrap your data access code in a Using block. The Using statement declares that you are using a disposable object for a short period of time. As soon as the Using block ends, the CLR releases the corresponding object immediately by calling its Dispose() method. Interestingly, calling the Dispose() method of a Connection object is equivalent to calling Close(). That means you can rewrite the earlier example in the following, more compact, form:

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.

To really change how the ASP.NET navigation model works, you need to create your own site map provider. You might choose to create a custom site map provider for several reasons: You need to store site map information in a different data source (such as a relational database). You need to store site map information with a different schema from the XML format expected by ASP.NET. This is most likely if you have an existing system in place for storing site maps.

Dim connectionString As String = WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString Dim con As SqlConnection = New SqlConnection(connectionString) Using con con.Open() lblInfo.Text = "<b>Server Version:</b> " & con.ServerVersion lblInfo.Text &= "<br /><b>Connection Is:</b> " & con.State.ToString() End Using lblInfo.Text &= "<br /><b>Now Connection Is:</b> " lblInfo.Text &= con.State.ToString() The best part is that you don t need to write a finally block the Using statement releases the object you re using even if you exit the block as the result of an unhandled exception.

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