public void BindDataCmbHH() { lst = hhBUS.HangHoa_GetByTop("", "", ""); lst.Insert(0, new HangHoaObj("0", "--Select All--")); cmbThemHH.DataSource = lst; cmbThemHH.DisplayMember = "TenHH"; cmbThemHH.ValueMember = "MaHH"; cmbThemHH.SelectedIndex = 0; txtGia.Text = "0"; }