gistfile1.cs

var myareaorder = skiarea.Elements("Area").OrderBy(x => x.Attribute("Order").Value).ToList();

                    //Neu Gruppierung auf Skigebiets Area
                    var liftlistjoined = (from lift in liftlist
                                          join area in myareaorder
                                          on lift.Element("Memberships").Elements("Membership").FirstOrDefault().Elements("Area").FirstOrDefault().Attribute("RID").Value equals area.Value
                                          orderby area.Attribute("Order").Value
                                          select new { lift, area});                    

                    foreach (var liftarea in liftlistjoined)
                    {
                        var lift = liftarea.lift;

                        //Hole mir vom XML die AreaDESC                        
                        var areatext = liftarea.area.Attribute("Name" + lang.ToUpper()).Value;

                        Lifts mylift = ParseLift(lift, lang);
                        mylift.areaString = areatext;
                        mysnowreport.Lifts.Add(mylift);
                    }