运用xml动态改变网站的语言

    public static string Language()
  {
   if ("11"=="22")
    //*********************************需要修改
    return "ENG";
   else
    return "CHS";
  }

public static string GetString (string StringName)
  {
   XmlDocument doc = new XmlDocument();
   Page Page = new System.Web.UI.Page();
   doc.Load(Page.Server.MapPath("~/Language/"+Language()+"/Main.xml"));

   XmlNode child = doc.SelectSingleNode("//"+StringName);
   if (child != null)
   {
    return child.InnerText;
   }
   else
   {
    return "NULL";
   }
  }