using System;

​

public class BaseClass

{

    public virtual void VirtualMethod()

    {

        Console.WriteLine("VirtualMethod Base");

    }

    public void NonVirtualMethod()

    {

        Console.WriteLine("NonVirtualMethod Base");

    }

}

​

public class ChildClass:BaseClass

{

    public override void VirtualMethod()

    {

        Console.WriteLine("VirtualMethod ChildClass");

    }

    public new void NonVirtualMethod()

    {

        Console.WriteLine("NonVirtualMethod ChildClass");

    }

}

​

​

public class Program

{

    public static void Main()

    {

        BaseClass father = new BaseClass();

        BaseClass child = new ChildClass();

        ChildClass child2 = new ChildClass();

        Console.WriteLine("father");

        father.VirtualMethod();

        father.NonVirtualMethod();

        Console.WriteLine("Child 1");

        child.VirtualMethod();

        child.NonVirtualMethod();

        Console.WriteLine("Child 2");

        child2.VirtualMethod();

        child2.NonVirtualMethod();

    }

}

​