MyNotesManager myNotesManager = new MyNotesManager();
            myNotesManager.ReadMyNotesFromCache = false;

IDictionary<int, int> notes = myNotesManager.GetAllMyNotes().
                GroupBy(p => new { p.UserId }).
                Select(group => new { UserName = group.Key, NumberOfNotes = group.Count() }).
                GroupBy(p => new { p.NumberOfNotes }).
                Select(group => new { NumberOfNotes = group.Key.NumberOfNotes, NumberOfUsers = group.Count() }).
                OrderByDescending(key => key.NumberOfNotes).
                ToDictionary(col1 => col1.NumberOfNotes, col2 => col2.NumberOfUsers);

List<string> userName