inherit

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace
{
    class Program
    {

        static void Main(string[] args)
        {

            goHomeByTrain bytrain = new goHomeByTrain();

            bytrain.sele();

        }
    }

    public class goHomeByTrain : selebreate
    {
        protected  override void GoHomeBy()
        {
            Console.WriteLine("go home by train!");
        }

    }

    public abstract class selebreate
    {
        public void sele()
        {
            BookTicket();
            GoHomeBy();
            SelebreateFe();
        }

     protected virtual     void   GoHomeBy()
    {
        Console.WriteLine("go home by ...");
    }
      protected  void   SelebreateFe()
{
    Console.WriteLine("selebreate Spring Festival ");
}
        protected  void BookTicket()
        {
        Console.WriteLine ("Book ticket!");
        }

    }
}