How to read xml file element values in c#.net

Hi Could any body help me , how to read "Error" element value from below xml file  in c3.net
 
<soapenv:Envelope xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance">  <soapenv:Body>  <PNRUpdateRS xmlns:upd="http://www.Test.com" xmlns:xsi="http://www.w3.org/2001/XMLSchemainstance">   <upd:RecordLocator>abcdef</upd:RecordLocator>  <upd:E ...