The System.Xml.XmlValidatingReader class is obsolete in dnprdnext. You can create a validating System.Xml.XmlReader instance by using the System.Xml.XmlReaderSettings class and the erload:System.Xml.XmlReader.Create method. For more information, see Validating XML Data with XmlReader.
If the reader is positioned on an EntityReference node (XmlNodeType.EntityReference), if XmlValidatingReader.Read is called after calling this method, the entity replacement text is parsed. After the entity replacement text is finished, an EndEntity node is returned to close the entity reference scope.
After calling this method, if the entity is part of an attribute value, you must call XmlValidatingReader.ReadAttributeValue to step into the entity.