Gets or sets a node in the site map that the data source then uses as a reference point to retrieve nodes from a hierarchical site map.
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The System.Web.UI.WebControls.SiteMapDataSource property binds to site map data and presents its view based on a specified starting node in the site map hierarchy. By default, the starting node is the root node of the hierarchy, but you can set the starting node to any node with the SiteMapDataSource.StartingNodeUrl property or set the SiteMapDataSource.StartFromCurrentNode property to true.
The value of the SiteMapDataSource.StartingNodeUrl property is stored in view state.