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The AddChildren() method simply searches the DataTable for records where the ParentID is the same as the current ID in other words, it finds all the parents for the current node. Each time it finds a child, it adds the child to the SiteMapNode.ChildNodes collection using the AddNode method that s inherited from StaticSiteMapProvider. Here s the complete code: private void AddChildren(SiteMapNode rootNode, string rootID, DataTable dtSiteMap) { DataRow[] childRows = dtSiteMap.Select("ParentID = " + rootID); foreach (DataRow row in childRows) { SiteMapNode childNode = new SiteMapNode(this, row["Url"].ToString(), row["Url"].ToString(), row["Title"].ToString(), row["Description"].ToString()); string rowID = row["ID"].ToString(); // Use the SiteMapNode AddNode method to add // the SiteMapNode to the ChildNodes collection. AddNode(childNode, rootNode); // Check for children in this node. AddChildren(childNode, rowID, dtSiteMap); } } The only limitation in the AddChildren() method is that it doesn t attempt to apply any sort of positioning. Instead, entries are added in the order they appear in the database. Changing this behavior isn t difficult. To do so, you need to add a SortOrder column to the database table. Then, you could sort the records before adding them using an overload of the DataTable.Select() method. The only remaining details are to fill a few other required overloads that retrieve the site map information: protected override SiteMapNode GetRootNodeCore() { return BuildSiteMap(); } public override SiteMapNode RootNode { get { return BuildSiteMap(); } } protected override void Clear() { lock (this) { rootNode = null; base.Clear(); } } This completes the example. You can now request the same pages you created earlier, using the new site map provider (as configured in the web.config file). The custom provider plugs in easily and neatly. The new information will flow through the custom provider and arrive in your pages without any indication that the underlying plumbing has changed.

Currently, the SqlSiteMapProvider returns the results ordered alphabetically by title. This means the About page always appears before the Contact Us page. This make sense for a quick test, but it isn t practical in a real site, where you probably want the ability to control the order in which pages appear. Fortunately, an easy solution exists. In fact, you don t even need to touch the SqlSiteMapProvider code. All you need to do is introduce a new field in the SiteMap table (say, OrdinalPosition) and modify the GetSiteMap procedure to use it: ALTER PROCEDURE GetSiteMap AS SELECT * FROM SiteMap ORDER BY ParentID, OrdinalPosition, Title GO First, records are sorted into groups based on the parent (which node they fall under). Next, they re ordered according to the OrdinalPosition values, if you ve supplied them. If you haven t, this step won t have any effect, and the final sort order (Title) will apply the alphabetical sort order, just like in the previous example.

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One issue you might notice with the SqlSiteMapProvider is that it stores the root node for the current site map in memory indefinitely. This means the SqlSiteMapProvider uses the same site map until the application domain is restarted (for example, when you rebuild your website or change its configuration settings). If you plan to change your site map regularly, you have several choices to make sure your application notices the change and refreshes the site map. The best option is to use the data cache to keep the root note around for a limited amount of time. You can use time-based expiry (for example, so the site map is refreshed once an hour). Here s a revised version of the BuildSiteMap() method that uses caching and keeps the site map in the cache for a number of seconds that s specified by an attribute in the custom provider tag in the web.config file: public override SiteMapNode BuildSiteMap() { SiteMapNode rootNode; lock (this) { rootNode = HttpContext.Current.Cache["rootNode"] as SiteMapNode; if (rootNode == null) { ... // Store the root node in the cache. HttpContext.Current.Cache.Insert("rootNode", rootNode, null, DateTime.Now.AddSeconds(cacheTime), TimeSpan.Zero); } } return rootNode; } If you want to get even more sophisticated, you can use SQL Server cache invalidation to automatically remove your cached site map when a change takes place in the SiteMap table. The only disadvantage is that this is a SQL Server specific feature, so it breaks the broad database compatibility enjoyed by the SqlSiteMapProvider (which currently supports any data source that has an ADO.NET data provider and data factory).

When the user selects a song from the list after selecting an album, he or she will enter this part of the method as currentState will equal STATE_SELECT_SONG.

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