private void LoadDanhSachLoaiDienThoai() { clsLoaiDT_BUS _loaiBUS = new clsLoaiDT_BUS(); cboLoaiDT.DataSource = _loaiBUS.DanhSachLoaiDT(); cboLoaiDT.DisplayMember = "TenLoaiDT"; cboLoaiDT.ValueMember = "MaLoaiDT"; }