private void UpdateCollectionServices(User user, List<Service> services)
 {
     db.Entry(user).Collection(a => a.Services).Load();
     var tmpServices=user.Services.ToList();
     foreach (var service in tmpServices)
     {
         if (!services.Any(a => a.Id == service.Id))
         {
             user.Services.Remove(service);
         }
     }
     foreach (var service in services)
     {
         if (!user.Services.Any(a => a.Id == service.Id))
         {
             user.Services.Add(service);
         }
     }
     db.SaveChanges();
 }
 private void UpdateCollectionPostes(User user, List<PosteTravail> postes)
 {
     db.Entry(user).Collection(a => a.PosteTravails).Load();
     var tmpPostes = user.PosteTravails.ToList();
     foreach (var poste in tmpPostes)
     {
         if (!postes.Any(a => a.Id == poste.Id))
         {
             user.PosteTravails.Remove(poste);
         }
     }
     foreach (var poste in postes)
     {
         if (!user.PosteTravails.Any(a => a.Id == poste.Id))
         {
             user.PosteTravails.Add(poste);
         }
     }
     db.SaveChanges();
 }