days till next birthday

        public static int DaysTillNextBirthday(DateTime dateOfBirth)
        {
            //full days (whole, 24-hr periods) until next birthday...
            int result = 0;
            DateTime dtToday = DateTime.Now;
            DateTime dtNextBirthday = new DateTime(dtToday.Year, dateOfBirth.Month, dateOfBirth.Day);
            TimeSpan tsDifference = dtNextBirthday - dtToday;

            if (tsDifference.Days < 0)
            {
                //already had birthday this year
                tsDifference = dtNextBirthday.AddYears(1) - dtToday;
            }
            result = tsDifference.Days;
            return result;
        }