List<string> words = new List<string>();
        cmd = new SqlCommand("Select tokens From tokens_all_comments", connection);
        connection.Open();
        dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            words.Add(dr["tokens"].ToString());
        }
        dr.Close();
        connection.Close();

Dictionary<string, int> dictionary = new Dictionary<string, int>();
        foreach (string word in words)
         {
         if (word.Length != 0)
         {
        if ( dictionary.ContainsKey(word) )
        {
         dictionary[word]++;
          }
          else
                {
                    dictionary[word] = 1;
                }

          }
        }
        var sortedDict = (from entry in dictionary orderby entry.Value descending select entry).ToDictionary(pair => pair.Key, pair => pair.Value);