xdocument elements getting by SafeElement function

  public string SafeElem(XDocument  x, string tag, string _default_)
        {
            string r = _default_;
            IEnumerable<XElement> a = x.Elements(tag);
            if (a!=null && a.Count() >0)
            {
                string g= a.First().Value;
                if (!string.IsNullOrEmpty(g))
                {
                    r = g;
                }
            }
            return r;
        }