dotnet xml: http://msmvps.com/coad/archive/2004/06/22/8692.aspx
Using XmlDocument.Save(string file) produces a file with nicely indented
elements. XmlDocument.OuterXml returns a string without any formatting. If
you want a nicely formatted string (to display to the user, write to
console, etc), without directly writing to a file, you must use the
XmlTextWriter.
using System.IO;
using System.Xml;

public static string FormatXML(XmlDocument doc)
{
// Create a stream buffer that can be read as a string
using (StringWriter sw = new StringWriter())

// Create a specialized writer for XML code
using (XmlTextWriter xtw = new XmlTextWriter(sw))
{
// Set the writer to use indented (hierarchical) elements
xtw.Formatting = System.Xml.Formatting.Indented;

// Write the XML document to the stream
doc.WriteTo(xtw);

// Return the stream as a string
return sw.ToString();
}
}

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How would I write an XmlDocument to a file so that each node is properly
indented and followed by a carriage return?