protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack == false)
        {
            XmlDocument xd = new XmlDocument();
            xd.Load(Server.MapPath("~/App_Data/rub.xml"));
            XmlNode xn = xd.SelectSingleNode(@"/rubriki/Level1[@id=""Audio""]");
            if (xn != null)
            {
                Label1.Text = xn.Attributes[Profile.UICulture].Value;
            }
        }
    }

<?xml version="1.0" encoding="utf-8" ?>
<katalog>
  <Level1 id="Audio" en="Audio" ru="Аудио">
    <Level2 id="mp3pl" en="Player" ru="Плееры"></Level2>
  </Level1>
</katalog>