get first and last date of week by passing week number and year

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C#

ASP.NET

hi ..

how i get start and end date of week..

i will pass .. Week number and year ...
or Any Date

and it return start and end date of that week...

example

week number = 1

year = 2012

1/1/2012 8/1/2012


week number 48

year = 2011


1/2/2012 6/1/2012



I TRY THIS CODE

DateTime strtdt = DateTime.ParseExact(tx_dt.Text, "dd/MM/yyyy", null);

       GregorianCalendar cal = new GregorianCalendar(GregorianCalendarTypes.Localized);
       int week = cal.GetWeekOfYear(strtdt, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

       int year = strtdt.Year;

       DayOfWeek day = DayOfWeek.Monday;
       DateTime startOfYear = new DateTime(year, 1, 1);

       // The +7 and %7 stuff is to avoid negative numbers etc.
       int daysToFirstCorrectDay = (((int)day - (int)startOfYear.DayOfWeek) + 7) % 7;



       DateTime FirstDay = startOfYear.AddDays(7 * (week - 1) + daysToFirstCorrectDay);
       DateTime Endaday = startOfYear.AddDays(7 * (week - 1) + daysToFirstCorrectDay).AddDays(6);

       TextBox4.Text = FirstDay.ToString("dd/MM/yyyy");
       TextBox5.Text = Endaday.ToString("dd/MM/yyyy");

but it working fine only for year .. .when previoues year week is 53...
its working fine for 2011 , 2012 .. but when i m checking for 2013 it giving next week date