private void ClearSecurities()
        {
            lock (_sync)
            {
                _trie.Clear();
                _allSecurities.Clear();
            }

            //ExcludedCount = 0;

            Cleared.SafeInvoke();
        }
 private void ClearSecurities()
 {
     _trie.Clear();
     Cleared.SafeInvoke();
 }