private void UpdateModel(Gallery obj, GalleryPostModel model)
{
var evt = (model.EventID.HasValue) ? Repo.GetById<Event>(model.EventID.Value) : null;
obj.Update(model.Name, model.Slug, model.Date,evt);
obj.SetDefaultImage(Repo.GetById<Image>(model.DefaultImageID));
Repo.Save(obj);
}