using System;

public class Program

{

    public static void Main()

    {

        var DateStart = DateTime.Today.AddDays(-6 + -(int)DateTime.Today.DayOfWeek);

        var DateEnd = DateStart.AddDays(6);

​

        Console.WriteLine(DateStart.ToString("MM/dd/yyyy"));

        Console.WriteLine(DateEnd.ToString("MM/dd/yyyy"));

    }

}