How can I calculate/find the week-number of a given date?

Question

How can I calculate/find the week-number of a given date?

Answer 1

  public static int GetWeekNumber(DateTime dtPassed)
  {
          CultureInfo ciCurr = CultureInfo.CurrentCulture;
          int weekNum = ciCurr.Calendar.GetWeekOfYear(dtPassed, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
          return weekNum;
  }