Virtual in C#

Virtual.cs

using System;

namespace ConsoleApplication1
{
    internal class A
    {
        public virtual void Foo()
        {
            Console.WriteLine("Foo A");
        }
        public void Bar()
        {
            Console.WriteLine("Bar A");
        }
    }
	
    internal class B : A
    {
        public override void Foo()
        {
            Console.WriteLine("Foo B");
        }
        public void Bar()
        {
            Console.WriteLine("Bar B");
        }
    }
	
    internal class C : A
    {
        public void Foo()
        {
            Console.WriteLine("Foo C");
        }
        public new void Bar()
        {
            Console.WriteLine("Bar C");
        }
    }
	
    internal class Program
    {
        private static void Main()
        {
            A ab = new B();
            A ac = new C();

            ab.Foo();
            ab.Bar();

            ac.Foo();
            ac.Bar();

            Console.WriteLine("-----------");

            B bb = new B();
            bb.Foo();
            bb.Bar();

            Console.WriteLine("-----------");

            C cc = new C();
            cc.Foo();
            cc.Bar();

            Console.ReadLine();
        }
    }
}