SPNavigationNode Class
This object represents the URL to a specific navigation node in an arbitrary hierarchy and provides methods for manipulating the position of the node and properties for setting node characteristics.
Namespace: Microsoft.SharePoint.Navigation
Assembly: Microsoft.SharePoint (in microsoft.sharepoint.dll)
Assembly: Microsoft.SharePoint (in microsoft.sharepoint.dll)
Unlike the SPNavigationNodeCollection class, the SPNavigationNode class requiresyou to call the Update method to cause property changes to existing nodes to be saved to the database. Moves, however, occur immediately.