private void button2_Click(object sender, EventArgs e)
        {
            foreach (CDCDS.CDC_ENTIRow riga in _DS.CDC_ENTI.Rows)
            {
                if (riga.RowState == DataRowState.Added || riga.RowState == DataRowState.Modified)
                {
                    riga.UTENTE          = Contesto.Utente.FULLNAMEUSER;
                    riga.DATARIFERIMENTO = DateTime.Now;
                }
            }


            CDCBLL bll = new CDCBLL();

            bll.SalvaDatiEnti(_DS);
            _DS.AcceptChanges();

            _DS.CDC_ENTI.Clear();
            bll.CaricaEnti(_DS);
        }