<p>Could someone supply some code that would get the xpath of a System.Xml.XmlNode instance?</p>

<p>Thanks!</p>

There's no such thing as "the" xpath of a node. For any given node there may well be many xpath expressions which will match it.
You can probably work up the tree to build up
an
expression which will match it, taking into account the index of particular elements etc, but it's not going to be terribly nice code.
Why do you need this? There may be a better solution.