继承 ,构造方法使用

 class MortimerPhones
    {
        static void Main(string[] args)
        {
            Nevermore60Customer nc = new Nevermore60Customer("Peter");

            Console.WriteLine();
            Console.ReadLine();
        }
    }

    public abstract class GenericCustomer
    {
        private string name;
        private int age;
        public GenericCustomer()
            : base()
        {
            name = "<no name>";
            age = 18;
        }
        public GenericCustomer(string name)
        {
            this.name = name;
        }
    }
    class Nevermore60Customer : GenericCustomer
    {
        private string referrerName;
        private int highcostMinutesUsed;
         

        public Nevermore60Customer(string name, string referrerName)
            : base(name)
        {
            this.referrerName = referrerName;
        }

        public Nevermore60Customer(string name)
            : this(name, "<None>")
        {

        }
    }