Gets or sets the System.Web.SiteMapNode object that is the parent of the current node.
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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.ParentNode property calls the SiteMapProvider.GetParentNode(SiteMapNode) method, passing a reference to itself, to retrieve the parent System.Web.SiteMapNode.