private void btnSave_Click(object sender, EventArgs e) { for (int i = 0; i < deletedMaHD.Count; i++) { busHD.DeleteHoaDon(deletedMaHD[i]); } for (int i = 0; i < editedHD.Count; i++) { busHD.UpdateHoaDonInfo(editedHD[i]); } DisableResetAndSaveButton(); }