private long GetIndexMriPosition(long idbatch)
        {
            List <CBatch_detail_aa_twofold> lst = new CBatch_detail_aa_twofoldFactory().GetAll().Where(c => c.Idbatch == idbatch).ToList();

            if (lst.Count > 0)
            {
                long min_cod_interno = Convert.ToInt64(lst.Min(c => c.Cod_interno));
                long max_cod_interno = Convert.ToInt64(lst.Max(c => c.Cod_interno));

                for (long i = min_cod_interno; i < max_cod_interno + 15; i++)
                {
                    if (i % 15 == 6)
                    {
                        return(i);
                    }
                }
            }
            return(0);
        }