XML : How do I check something against XML attributes from List

I have a method below that returns List of xelements.

  public static List<XElement> GetSites()  {         List<XElement> returnElemnt = new List<XElement>();       if (Settings != null)       {          //Returns List<Xelement>            returnElemnt = GetAllSites(WSQueryText);       }       return returnElemnt;  }    

From the returned List. I also want to check if this XML contains certain attributes. If it does, then I want to set certain conditions based on the attributes as mentioned in the code below.

          XmlDocument xmlDoc = new XmlDocument();          xmlDoc.LoadXml(@"test.xml");          XmlNamespaceManager nsmngr = new XmlNamespaceManager(xmlDoc.NameTable);          nsmngr.AddNamespace("srch", "urn:Microsoft.Search.Response");          nsmngr.AddNamespace("doc", "urn:Microsoft.Search.Response.Document");          foreach (XmlNode site in xmlDoc.SelectNodes("//srch:Response/srch:Range/srch:Results/doc:Document", nsmngr))          {              bool hasAccess = HasAccess(site, "OWNER", nsmngr, accessIds);                             if (!hasAccess)              {                  XmlAttribute attr = xmlDoc.CreateAttribute("Locked");                  attr.Value = "true";                  site.Attributes.Append(attr);              }          }          resultXml = xmlDoc.OuterXml;    

How can I check this against the list of xElements within the same method?