C# Understanding Scopes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace UnderstandingScope
{
    class Program
    {
        //private static string k = "";
        static void Main(string[] args)
        {
           /*
            string j = "";
            for (int i = 0; i < 12; i++)
            {
                j = i.ToString();
                k = i.ToString();
                Console.WriteLine(i);

                if(i == 9)
                {
                    string l = i.ToString();
                }
                //Console.WriteLine(l);
            }
            //Console.WriteLine(i);
            Console.WriteLine("Outside of for loop : "+ j);
            //Console.WriteLine("K = " + k);
            helpermethod();
            */
            Car car = new Car();

            car.DoSomething();
            Console.ReadLine();
        }
        /*
        static void helpermethod()
        {
            Console.WriteLine("K From helpermethod : " + k);
        }
         */

        class Car
        {
           public void DoSomething()
            {
               Console.WriteLine(helperMethod());
            }
            private string helperMethod()
            {
                return "Hello World";
            }
        }
    }
}