Gets the previous System.Web.SiteMapNode object on the same level as the current one, relative to the SiteMapNode.ParentNode object (if one exists).
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The SiteMapNode.PreviousSibling property presumes that the site map provider implements its internal collections such that when a parent node retrieves its SiteMapNode.ChildNodes objects, the nodes are in the same order as they appear in the site map. If you use .NET Framework collection classes in an implementation of a System.Web.SiteMapProvider provider, choose collections that implement the IList interface, such as the ArrayList or System.Collections.Specialized.ListDictionary class. If you choose collections that do not implement the IList interface, such as the Hashtable class, unexpected results can occur for simple site navigation operations.