private List <DateTime> ResultByMonths(DateTime startOfYear)
        {
            List <DateTime> result = null;

            if (!IsEmpty(ByMonths))
            {
                result = new List <DateTime>();
                foreach (var month in ByMonths.Distinct().OrderBy(_ => _))
                {
                    if (month >= Month.January && month <= Month.December)
                    {
                        for (var dt = startOfYear.AddMonths((int)month - 1); dt.Month == (int)month; dt = dt.AddDays(1))
                        {
                            result.Add(dt);
                        }
                    }
                }

                //result.Sort();
                //result = FilterBySetPosition(result, BySetPositions).ToList();
            }
            return(result);
        }