protected void btnThanhToan_Click(object sender, EventArgs e)
        {
            HttpCookie cookie = Request.Cookies["TenTK"];

            if (cookie != null)
            {
                string     tenTK = cookie.Value;
                DTO_HoaDon hd    = new DTO_HoaDon();
                hd.TenTaiKhoan    = tenTK;
                hd.NgayMua        = DateTime.Now;
                hd.DiaChiGiaoHang = "Tp.HCM";
                hd.SdtGiaoHang    = "0905939947";
                hd.TongTien       = BUS_GioHang.TinhTongTienGH(tenTK);
                hd.MaHD           = BUS_HoaDon.ThemHD(hd);
                DataTable dtbKetQua = BUS_GioHang.LayGH(tenTK);
                foreach (DataRow dr in dtbKetQua.Rows)
                {
                    DTO_CTHoaDon cthd = new DTO_CTHoaDon();
                    cthd.MaHD    = hd.MaHD;
                    cthd.MaSP    = dr["MaSP"].ToString();
                    cthd.SoLuong = Convert.ToInt32(dr["SoLuong"]);
                    cthd.DonGia  = Convert.ToInt32(dr["GiaTien"]);
                    BUS_CTHoaDon.ThemCTHD(cthd);
                }
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            HttpCookie cookie = Request.Cookies["TenTK"];

            if (cookie != null)
            {
                string tenTK = cookie.Value;
                if (!Page.IsPostBack)
                {
                    DataTable dtbKetQua = BUS_GioHang.LayGH(tenTK);
                    rptGiohang.DataSource = dtbKetQua;
                    rptGiohang.DataBind();
                    lblTongTien.Text = BUS_GioHang.TinhTongTienGH(tenTK).ToString();
                }
            }
            else
            {
                Response.Redirect("Login.aspx");
            }
        }