XML Nodes

How do I get the total number of nodes in an xml document?

i've tried
dim myxmlnode as xml.xmlnode

msgbox myxmlnode.childnodes.count

it doesn't work, any ideas? thank you.

VB Code:

Dim xdoc As New XmlDocument
        xdoc.Load("..\data.xml")
        Dim xnods As XmlNodeList = xdoc.SelectNodes("//*")
        MsgBox(xnods.Count)

Although remember that the root counts as well as any parent nodes.