using System;

​

public class Base

{

    public void BadStart()

    {

        Console.WriteLine("Hello from Base");

    }

    virtual public void GoodStart()

    {

        Console.WriteLine("Hello from Base");

    }

}

​

public class Derived : Base

{

    new public void BadStart()

    {

        Console.WriteLine("Hello from Derived");

    }

    override public void GoodStart()

    {

        Console.WriteLine("Hello from Derived");

    }

}

public class Program

{

    public static void Main()

    {

        Base obj = new Derived();

        obj.BadStart(); // Hello from Base

        obj.GoodStart(); // Hello from Derived

    }

}