Linq To Xml

[EDN Admin]

displaying my weak understanding of Linq to Xml and asking for help. I was trying to do this cast and then do a query.

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<td><font style="font-size:11px XmlDocument </font><font style="color:red doc</font><font style="font-size:11px  = </font><font style="color:blue new</font><font style="font-size:11px  XmlDocument ( );  </font></td></tr>
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<td style="background-color:#f7f7f7                 doc.Load ( path );  </td></tr>
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<td>                XmlNodeList </font><font style="color:red rootNodeList</font><font style="font-size:11px  = </font><font style="color:blue doc</font><font style="font-size:11px .GetElementsByTagName ( "root" );  </font></td></tr>
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<td style="background-color:#f7f7f7                 XmlNode </font><font style="color:red rootNode</font><font style="font-size:11px  = </font><font style="color:blue rootNodeList</font><font style="font-size:11px .Item ( 0 );  </font></td></tr>
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<td>                System.Collections.IEnumerable </font><font style="color:red que</font><font style="font-size:11px  = ( System.Collections.IEnumerable )rootNode.ChildNodes.Cast</font><font style="color:blue <</font><font style="font-size:11px XmlNode</font><font style="color:blue ></font><font style="font-size:11px  ( );  </font></td></tr>
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<td style="background-color:#f7f7f7                    </td></tr>
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<td>                XmlNode elem;  </td></tr>
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<td style="background-color:#f7f7f7                 var </font><font style="color:red qMethods</font><font style="font-size:11px  = ( from elem in que  </font></td></tr>
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<td>                                 where </font><font style="color:red elem.Name</font><font style="font-size:11px  == this.ext + "Files_" + Globals.hostName  </font></td></tr>
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<td style="background-color:#f7f7f7                                  select elem ).Take ( 1 ); </td></tr></tbody></table> The error message (at compile) I am getting is as follows:

Error 1 Could not find an implementation of the query pattern for source type System.Collections.IEnumerable.  Where not found.  Consider explicitly specifying the type of the range variable elem. 

I also tried to cast it as IQueable with teh same result.

Thanks in advance.
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