private void Parse(string text)
        {
            _allPairs.Clear();
            _pairsWithName.Clear();
            if (text==null)
                return;

            string[] p = text.Split(';');
            if (p==null)
                return;
            foreach(string pv in p)
            {
                if (pv.Length==0)
                    continue;
                string[] onep = pv.Split(new char[]{'='}, 2);
                if (onep==null)
                    continue;
                NameValuePair nvp = new NameValuePair(onep[0].Trim().ToLower());
                if (onep.Length<2)
                    nvp.Value = "";
                else
                    nvp.Value = onep[1];

                _allPairs.Add(nvp);

                // index by name
                ArrayList al = _pairsWithName[nvp.Name] as ArrayList;
                if (al==null)
                {
                    al = new ArrayList();
                    _pairsWithName[nvp.Name] = al;
                }
                al.Add(nvp);
            }
        }