A RichTextDocument has a single root node of DocumentRootNode type, specified via the RichTextDocument.RootNode property. DocumentRootNode contains a one and only one instance of DocumentBodyNode, which represents the document's contents. DocumentBodyNode can be associated with a DocumentRootNode by adding it to the NodeBase.ChildNodes collection of the DocumentRootNode.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2