/// <summary>
        /// Chia làm 2 hướng, init DS VT kho xuất chính, init theo DS VT theo kho mượn.
        /// </summary>
        private void init_cbMaVatTu()
        {
            int ID_Kho = getIDKho();
            if (ID_Kho < 0)
            {
                cbMaVatTu.DataSource = null;
                cbMaVatTu.AutoCompleteCustomSource = null;
                return;
            }

            cbMaVatTu.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            cbMaVatTu.AutoCompleteSource = AutoCompleteSource.CustomSource;

            clsTonKho vt = new clsTonKho();
            AutoCompleteStringCollection combData1 = vt.getListMaVatTu(ID_Kho);

            cbMaVatTu.AutoCompleteCustomSource = combData1;

            cbMaVatTu.DataSource = vt.getAll_Ma_Ten_VatTu(ID_Kho);
            cbMaVatTu.ValueMember = "ID_Vat_tu";
            cbMaVatTu.DisplayMember = "Ma_vat_tu";

            cbMaVatTu.SelectedIndex = -1;
        }