TODO:
Have you ever wanted to get the week of the year by using a a custom first day of the week?
SOLUTION:
var weekOfYear = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(
DateTime.Now,
CalendarWeekRule.FirstDay,
DayOfWeek.Monday);
NOTES:
This sample will get the week of the year by using the FirstDay of the week set to Monday, rather than the default of Sunday.