public void Update(ref Category category, ref IAuctionTransaction trans)
 {
     using (var records = new CategoryCollection())
     {
         var filter = new PredicateExpression(CategoryFields.Id == category.Id);
         var c = new CategoryEntity
                     {
                         AccountId = category.AccountId,
                         Name = category.Name
                     };
         if (trans != null)
         {
             trans.Add(records);
         }
         records.UpdateMulti(c, filter);
     }
 }