Reading XML file which contains namespaces

Hi all,
I have an excel vba application which outputs some data as XML.  I need to read this xml data in a .NET application.  The file automatically contains several namespaces which I can't prevent.  Here is the XML file (similified):

 xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882'
 xmlns:rs='urn:schemas-microsoft-com:rowset'
 xmlns:z='#RowsetSchema'>

   
  
   
  
  
   
    
  
 


 



Usually there are loads of z:row elements, it is these that I need to get.  The code I have written uses XPath to get to them, but is complicated by namespaces, and at the moment returns no rows at all.  I load an XmlDocument called xmlDoc, and then my code is:


XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsMgr.AddNamespace("", xmlDoc.DocumentElement.NamespaceURI);
nsMgr.AddNamespace("s", xmlDoc.DocumentElement.NamespaceURI);
nsMgr.AddNamespace("dt", xmlDoc.DocumentElement.NamespaceURI);
nsMgr.AddNamespace("rs", xmlDoc.DocumentElement.NamespaceURI);
nsMgr.AddNamespace("z", xmlDoc.DocumentElement.NamespaceURI);
XmlElement root = xmlDoc.DocumentElement;
XmlNodeList nodes = root.SelectNodes(@"/xml/rs:data/z:row",nsMgr);
 

Whilst this doesn't generate an error, it also doesn't return any rows.  Anyone know what I am doing wrong?

Thanks in advance!