C# OO - Abstract Classes & Methods

using System;

namespace LearnCS
{
    abstract class Prim
    {
        public abstract void PrimPrinter();        
    }

    class Sec : Prim
    {
        public override void PrimPrinter()
        {
            Console.WriteLine("Now I can be used");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {

            Sec p1 = new Sec();
            p1.PrimPrinter();

            Console.ReadLine();
        }
    }
}