Gets the root node of the root provider in a site map provider hierarchy. If no provider hierarchy exists, the SiteMapNode.RootNode property gets the root node of the current provider.
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The System.Web.SiteMapNode class relies on the site map provider with which it is associated to track its relationships to other nodes in the site map. The SiteMapNode.RootNode property calls the SiteMapProvider.RootNode property of the root provider (the SiteMapProvider.RootProvider property) to retrieve the root node.