//Rextester.Program.Main is the entry point for your code. Don't change it.

//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

namespace Rextester

{

    public class Program

    {

        class a

        {

                public void m1()

                {

                    Console.WriteLine("Non Virtual");

                }

                public virtual void m2()

                {

                    Console.WriteLine("Non Virtual");

                }

        }

        class b : a

        {

                public void m1()

                {

                    Console.WriteLine("Virtual");

                }

                public override void m2()

                {

                    Console.WriteLine("Virtual");

                }

        }

        public static void Main(string[] args)

        {

            a obj = new a();

            obj.m1();

            obj.m2();

            //Your code goes here

            Console.WriteLine("Hello, world!");

        }

    }

}