How can I determine the week number of a certain date?

Question

I\'m trying to make a calendar using wpf. By using itemsPanel and more, I have a grid with 7 columns(sunday-saturday) and 6 rows(week# of month). If i can find the starting

Answer 1

With @Polynomial answer, I have this error:

An object reference is required for the non-static field, method, or property...

If you instanciate GregorianCalendar before then you can call the method GetWeekOfYear !

private static int GetWeekNumber(DateTime time)
{
    GregorianCalendar cal = new GregorianCalendar();
    int week = cal.GetWeekOfYear(time, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday);
    return week;
}