private void grdElementi_SelectionChanged(object sender, EventArgs e) { if (grdElementi.SelectedRows.Count == 1) { long progressivo = (long)grdElementi.SelectedRows[0].Cells["Progressivo"].Value; using (context = CreateDatabaseContext()) { EventiManagerNew manager = new EventiManagerNew(context); numCopie.Value = manager.GetCopiesOfItemsToPrint(codEvento.Value, progressivo); } } else { numCopie.Value = 0; } }