C# Lesson 19 : Understanding Scope and Utilizing Accessibility Modifiers

Explore the scope of variables within code blocks and how accessibility modifiers, such as Public, Private, and Protected, are used by the .NET Framework Class Library to expose or hide implementation of their given services to consumers of that given class. This is sometimes referred to as "encapsulation."

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 < 10; i++)
            {
                j = i.ToString();
                k = i.ToString();
                Console.WriteLine(i);

                if (i == 9)
                {
                    string l = i.ToString();
                }
                //Console.WriteLine("l: " + l);
            }
            //Console.WriteLine(i);

            Console.WriteLine("Outsite of the for: " + j);
            //Console.WriteLine("k: " + k);
            helperMethod();
             */


            Car car = new Car();

            car.DoSomething();


            Console.ReadLine();
        }

        /*
        static void helperMethod()
        {
            Console.WriteLine("k from the helperMethod: " + k);
        }
         */

    }

    class Car
    {
        public void DoSomething()
        {
            Console.WriteLine(helperMethod());
        }

        private string helperMethod()
        {
            return "Hello world!";
        }

    }

}
Source : MS Virtual Academy