public void Checkout(object currentUser)
        {
            double total = 0;

            foreach (var item in MemberShoppingCart)
            {
                total += item.Price;
            }
            Console.WriteLine("Thankyou for shopping with us. Your subtotal is $ {0} ", total.ToString());
            BronzeMember cali     = new BronzeMember(04, "Cali OConnor");
            SilverMember caroline = new SilverMember(03, "Caroline OConnor");
            SilverMember kevin    = new SilverMember(02, "Kevin OConnor");
            GoldMember   carr     = new GoldMember(01, "Carr OConnor");

            if (currentUser.ToString() == carr.ToString())
            {
                total = total - (total * .15);
                Console.WriteLine("Thankyou for shopping with us. Your total after your membership discount is $ {0} ", total.ToString());
            }
            else if (currentUser.ToString() == cali.ToString())
            {
                total = total - (total * 1);
                Console.WriteLine("Thankyou for shopping with us. Your total after your membership discount is $ {0} ", total.ToString());
            }
            else if (currentUser.ToString() == caroline.ToString())
            {
                total = total - (total * .1);
                Console.WriteLine("Thankyou for shopping with us. Your total after your membership discount is $ {0} ", total.ToString());
            }
            else if (currentUser.ToString() == kevin.ToString())
            {
                total = total - (total * .1);
                Console.WriteLine("Thankyou for shopping with us. Your total after your membership discount is $ {0} ", total.ToString());
            }
        }