$ dotnet run
This is VirtualMethodSample(Child Class).

using System;

namespace console
{
    class Program
    {
        static void Main(string[] args)
        {
            VirtualSuperClass VirtualSample = new VirtualChildClass();
            VirtualSample.VirtualMethodSample();
        }
    }

    public class VirtualSuperClass
    {
        public virtual void VirtualMethodSample()
        {
            Console.WriteLine("This is VirtualMethodSample(Super Class).");
        }
    }

    public class VirtualChildClass : VirtualSuperClass
    {
        public override void VirtualMethodSample()
        {
            Console.WriteLine("This is VirtualMethodSample(Child Class).");
        }
    }
}