protected void BT_Canje_Click(object sender, EventArgs e)
    {
        LUser        datos = new LUser();
        int          Id    = int.Parse(Session["user_id"].ToString());
        DataTable    data  = datos.redimir(Id);
        Button       btn   = (Button)sender;
        DataListItem item  = (DataListItem)btn.NamingContainer;
        Label        lblid = (Label)item.FindControl("Label1");
        int          x     = int.Parse(lblid.Text);

        datos.cortesia(x);
        this.RegisterStartupScript("mensaje", "<script type='text/javascript'>alert('Reservado');window.location=\"Resrvas.aspx\"</script>");
    }