using System;

​

public class Program

{

    public static void Main()

    {

        new MyClassB();

        new MyClassC();

    }

​

    public enum MyEnum

    {

        A,

        B,

        C

    }

​

    public abstract class MyClassA

    {

        public abstract MyEnum myEnum

        {

            get;

            set;

        }

    }

​

    public class MyClassB : MyClassA

    {

        public sealed override MyEnum myEnum

        {

            get;

            set;

        }

​

        public MyClassB()

        {

            myEnum = MyEnum.B;

            Console.WriteLine(myEnum);

        }

    }

​

    public class MyClassC : MyClassA

    {

        public sealed override MyEnum myEnum

        {

            get;

            set;

        }

​

        public MyClassC()

        {

            myEnum = MyEnum.C;

            Console.WriteLine(myEnum);

        }

    }

}