private void bindingNavigatorSaveItem_Click(object sender, EventArgs e) { if (KiemTraTruocKhiLuu("colMaKH") == true && KiemTraTruocKhiLuu("colTenKH") == true && KiemTraTruocKhiLuu("colSDT") == true && KiemTraTruocKhiLuu("colDiaChi") == true) { bindingNavigatorPositionItem.Focus(); m_KhachHangCtrl.LuuNguoiDung(); } }