How do I determine if a given date is the Nth weekday of the month?

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You could change the check of the week so the function would read:

private bool NthDayOfMonth(DateTime date, DayOfWeek dow, int n){
  int d = date.Day;
  return date.DayOfWeek == dow && (d-1)/7 == (n-1);
}

Other than that, it looks pretty good and efficient.

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