File Directory Stream C# Tutorial

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using System;
using System.IO;
    class Tester
    {
        public static void Main()
        {
            FileInfo theSourceFile = new FileInfo("test.cs");
            StreamReader reader = theSourceFile.OpenText();
            StreamWriter writer = new StreamWriter("test.bak", false);
            string text;
            do
            {
                text = reader.ReadLine();
                writer.WriteLine(text);
                Console.WriteLine(text);
            } while (text != null);
            reader.Close();
            writer.Close();
        }
    }