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A System.Web.SiteMapNode object is modifiable by default.
All nodes that are returned by the System.Web.XmlSiteMapProvider are read-only, by default.
The SiteMapNode.Attributes, SiteMapNode.ChildNodes, SiteMapNode.Description, SiteMapNode.ParentNode, SiteMapNode.Roles, SiteMapNode.Title, and SiteMapNode.Url property mutators check the SiteMapNode.ReadOnly property before attempting to modify the property of a site map node. If the node is read-only when a mutator is called, the System.Web.SiteMapNode object throws an InvalidOperationException exception.