Find and fill gaps in a DateTime array

FillGapsInArray.cs

        /// <summary>
        /// Fill gaps in referred List  (based on date). 
        /// Dynamic due to a Period which add ticks to the DateTime instead of a static "Days" or dito.
        /// </summary>
        public static void FillGapsInArray(ref List<ObjectWithDateField> range, Period period)
        {
            long ticks = PeriodParse.GetTicks(period);
            List<ObjectWithDateField> gaps = new List<ObjectWithDateField>();

            DateTime compareAt = range.First().time;
            DateTime endAt = range.Last().time;

            while (compareAt <= endAt)
            {
                if (range.Where(d => d.time.Date == compareAt.Date).Count() < 1)
                    gaps.Add(new ObjectWithDateField()
                    {
                        time = compareAt,
                        value = 0.00
                        otherField = otherDummyValue,
                     });

                 compareAt = compareAt.AddTicks(ticks);
            }
            range = dateRange.Concat(gaps).ToList();
        }