Many .NET functions use XmlWriter to output/generate xml. Outputting to a file/string/memory is a very operation:
XmlWriter xw = XmlWriter.Create(PutYourStreamFileWriterEtcHere);
xw.WriteStartElement("root");
...
Sometimes , you need to manipulate the resulting Xml and would therefore like to load it into a XmlDocument or might need an XmlDocument for some other reason but you must generate the XML using an XmlWriter. For example, if you call a function in a 3rd party library that outputs to a XmlWriter only.
One of the things you can do is write the xml to a string and then load it into your XmlDocument:
StringWriter S = new StringWriter();
XmlWriter xw = XmlWriter.Create(S);
/* write away */
XmlDocument xdoc = new XmlDocument();
xdoc.LoadXml(S.ToString());
However this is inefficient - first you serialize all the xml info into a string, then you parse the string again to create the DOM.
How can you point an XmlWriter to build a XmlDocument directly?