Type Reason ArgumentException The text would result in a non-well formed XML document. InvalidOperationException 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.
If text is either null or String.Empty, this method writes an empty CDATA block, for example <![CDATA[]]>.