using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime date = DateTime.Now; //get current datetime 

        //get year from the date

        int year = date.Date.Year;

        //set the first day of the year

        DateTime firstDay = new DateTime(year, 1, 1);

        //get Day of the week 

        DayOfWeek day = date.DayOfWeek;

        CultureInfo cul = CultureInfo.CurrentCulture;

        //get no of week for the date

        int weekNo = cul.Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);

        //get no of day

        int days = (weekNo - 1) * 7;

        DateTime dt1 = firstDay.AddDays(days);

        DayOfWeek dow = dt1.DayOfWeek;

        DateTime startDateOfWeek = dt1.AddDays(-(int)dow);

        DateTime endDateOfWeek = startDateOfWeek.AddDays(6);

        Console.WriteLine("Start Of Week: " + startDateOfWeek.ToShortDateString());

        Console.WriteLine("End of week:" + endDateOfWeek.ToShortDateString());

    }

}