When overridden in a derived class, closes this stream and the underlying stream.
Assembly: System.Xml (in System.Xml.dll)
A call is made to write more output after Close has been called or the result of this call is an invalid XML document.
An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”
Any elements or attributes left open are automatically closed.
When you use the XmlWriter methods to output XML, the elements and attributes will not be written until you call the method. For example, if you are using the XmlWriter to populate an XmlDocument, until you close the XmlWriter, you will not be able to observe the written elements and attributes in the target document.