Get week no from date time C# .Net

The last parameter DayOfWeek.Monday the function will start first day of week on Monday.

int intWeekNO = 0;
intWeekNO = System.Globalization.CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(
                                pTimesheetDate,
                                System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);