Find total week no and dates between two dates in asp.net c#

//============  Week No & Date Handling for Week No Dropdownbox ==================//

       

DateTime start = DateTime.Today;// Adjust to your start date

//------ Total week no of Current Year

int w = (DateTime.IsLeapYear(System.DateTime.Now.Year) ? 366 : 365) / 7;

//------ Week No of Current Date

CultureInfo ciCurr = CultureInfo.CurrentCulture;

int weekNum = ciCurr.Calendar.GetWeekOfYear(start, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday);

// Get date of first day of a current week.

DateTime dt = GetFirstDayOfWeek(start, ciCurr);

for (int x = weekNum; x <= w; x++)

{

dropWeekNo.Items.Add(string.Format("Week: {0} ({1} - {2})", weekNum, dt.ToString("dd/MM/yyyy").Replace('-', '/'), dt.AddDays(6).ToString("dd/MM/yyyy").Replace('-', '/')));

dt = dt.AddDays(7);

weekNum++;

}

 public DateTime GetFirstDayOfWeek(DateTime dayInWeek, CultureInfo cultureInfo)

    {

        DayOfWeek firstDay = cultureInfo.DateTimeFormat.FirstDayOfWeek;

        DateTime firstDayInWeek = dayInWeek.Date;

        while (firstDayInWeek.DayOfWeek != firstDay)

            firstDayInWeek = firstDayInWeek.AddDays(-1);

        return firstDayInWeek;

    }