using System;

public class Program

{

    public static void Main()

    {

        //change the day here by changing it to: DateTime.Now.AddDays(1).DayOfWeek to see the effect it has on the result

        DayOfWeek shippingDay = DateTime.Now.DayOfWeek;

        //Array.IndexOf will return the index at which the item (in this case "shippingDay") exists in the array (here we've created a new array in the if, but could easily be stored in a variable)

        //so it will either return the index of the item (0 for saturday, 1 for sunday)

        //or if it's NOT present in the array (such as a monday) it will return -1

        //so we're checking to ensure that the day isn't a saturday before setting up the collection

        //we could have put the other days of the week in the array and checked if the result was >= 0 however going this route is slight quicker, and therefore slight more efficient.

        if(Array.IndexOf(new [] {DayOfWeek.Saturday, DayOfWeek.Sunday}, shippingDay) == -1)

        {

            //not a saturday/sunday (because the current day doesn't exist in the new[] array we created

            Console.WriteLine(Array.IndexOf(new [] {DayOfWeek.Saturday, DayOfWeek.Sunday}, shippingDay).ToString());

        }

        else

        {

            //it is a saturday/sunday - because it does exist

            Console.WriteLine(Array.IndexOf(new [] {DayOfWeek.Saturday, DayOfWeek.Sunday}, shippingDay).ToString());

        }

    }

}