using System;

public class Program

{

    public static void Main()

    {

        DateTime date = new DateTime(2024, 03, 13);

        Console.WriteLine(AddWorkingDays(date, 8).ToString());

    }

       public static DateTime AddWorkingDays(DateTime startDate, int daysToAdd)

       {

           int direction = Math.Sign(daysToAdd);

           int initialDayOfWeek = Convert.ToInt32(startDate.DayOfWeek);

​

           int weeksBase = Math.Abs(daysToAdd / 5);

           int addDays = Math.Abs(daysToAdd % 5);

​

           if ((initialDayOfWeek + addDays) > 5)

            addDays += 2;

           //if (addDays < initialDayOfWeek)

           //  addDays += 2;

​

           int totalDays = (weeksBase * 7) + addDays;

           return startDate.AddDays(totalDays * direction);

       }

}