private void Delete_Item(object sender, EventArgs e)
    {
        LinkButton selectedLink = (LinkButton)sender;
        string     link         = selectedLink.ID.Replace("del", "");
        int        cartId       = Convert.ToInt32(link);

        CartModel model = new CartModel();

        model.DeleteKoszyk(cartId);

        Response.Redirect("~/Pages/ShoppingCart.aspx");
    }