Decorator Desing pattern

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections;

using System.Data.SqlClient;

using System.Data;

using System.Diagnostics;

namespace BlogProject

{

      

    //Decorator Desing patern in C#

    class FirstClass

    {

        public void fFirstclass()

        {

            Console.WriteLine("I am First Class");

        }

    }

    class SecondClass : FirstClass

    {

        public void fSecondClass()

        {

            Console.WriteLine("I am second class");

        }

    }

    class ThirdClass : SecondClass

    {

        public void fThirdclass()

        {

            Console.WriteLine("I am Third Class");

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            ThirdClass objCls = new ThirdClass();

            objCls.fThirdclass();

            Console.ReadLine();

        }

    }

}