Changed the code to the following. Still the same problem. Anyone else out there have any ideas?
XPathNodeIterator Serversiter = ServersNAV.Select(''/dfs:myFields/dfs:dataFields/dfs:Server_List/@Server'', this.NamespaceManager);
XPathNavigator parent = ds.CreateNavigator().SelectSingleNode(''/my:myFields/my:Servers'', ...