Enumeration Classes - Part 1 - PaymentType Enumeration with Behavior

PaymentType.cs

public abstract class PaymentType : Enumeration
{
    public static readonly PaymentType DebitCard = new DebitCardType();

    public static readonly PaymentType CreditCard = new CreditCardType();

    public abstract string Code { get; }

    private PaymentType(int value, string name = null) : base(value, name)
    {
    }

    private class DebitCardType : PaymentType
    {
        public DebitCardType() : base(0, "DebitCard")
        {
        }

        public override string Code => "DC";
    }

    private class CreditCardType : PaymentType
    {
        public CreditCardType() : base(1, "CreditCard")
        {
        }

        public override string Code => "CC";
    }
}