public List <OrderViewModel> Read(OrderBindingModel model)
 {
     if (model == null)
     {
         return(_orderStorage.GetFullList());
     }
     if (model.Id.HasValue)
     {
         return(new List <OrderViewModel> {
             _orderStorage.GetElement(model)
         });
     }
     return(_orderStorage.GetFilteredList(model));
 }