using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

    public class A

    {

        public virtual string GetData()

        {

            return "";

        }

​

        public int GetValue() {

            return 1;

        }

    }

​

    public class B : A

    {

        public override string GetData()

        {

            return "";

        }

​

        public new int GetValue()

        {

            return 1;

        }

    }