using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        using (StreamWriter sw = new StreamWriter(@"myText.txt"))

               //bc its on dotnerfiddle you have a virtual file space and dont need to specify where the file is.

        {

        sw.WriteLine("first line var1, first line var 2, first line var 3");

        sw.WriteLine("second line var1, second line var 2, secondline var 3");

        sw.WriteLine("third line var1, third line var 2, third line var 3");

        sw.WriteLine("fourth line var1, fourth line var 2, fourth line var 3");

            // you actually have five lines one of which is null(empty), where the cursor flashes

        }

        using (StreamReader sr = new StreamReader(@"myText.txt"))

        {

            string line ="";

            while((line = sr.ReadLine()) != null)

            // you have to put line = sr.Readline bc it will use line = sr.ReadLine as a comparison 1st. when in brackets it will see if its != to null first and then make it equal to nothing.

            {

           Console.WriteLine (line);

            }

        }

    }

}