public AddPhieuQuaTangDlg(ctrlPhieuQuaTang ctrl) { InitializeComponent(); _ctrlPhieuQuaTang = ctrl; txtMaVach.Text = _ctrlPhieuQuaTang.GetNewSoPhieu().ToString(); dtpHSD.Value = dtpHSD.Value.AddMonths(8); ckPhieuDoiDiem.Checked = true; LoadKhachHang(); }