get number of sundays in a month c#
static int NumberOfParticularDaysInMonth(int year, int month, DayOfWeek dayOfWeek)
{
DateTime startDate = new DateTime(year, month, 1);
int totalDays = startDate.AddMonths(1).Subtract(startDate).Days;
int answer = Enumerable.Range(1, totalDays)
.Select(item => new DateTime(year, month, item))
.Where(date => date.DayOfWeek == dayOfWeek)
.Count();
return answer;
}
int numberOfThursdays = NumberOfParticularDaysInMonth(2010, 9, DayOfWeek.Thursday);