Type Reason InvalidOperationException No start tag was open, or the XmlTextWriter.WriteState is WriteState.Closed.
In the dnprdnext release, the recommended practice is to create System.Xml.XmlWriter instances using the erload:System.Xml.XmlWriter.Create method and the System.Xml.XmlWriterSettings class. This allows you to take full advantage of all the new features introduced in this release. For more information, see Creating XML Writers.
This method always writes the full end tag. This is useful when dealing with elements that must include a full end tag. For example, browsers expect HTML script blocks to be closed with "</script>".