//清空购物车 protected void BtnClearAll_Click(object sender, EventArgs e) { if (Session["UserId"] != null) { int uid = int.Parse(Session["UserId"].ToString()); if (!cartService.IsCartItemEmptyByUserId(uid)) { cartService.ClearCartItemByUserId(uid); Response.Write("<script>window.location.href='ProCart.aspx'</script>"); } } else { Response.Redirect("Login.aspx"); } }