File Stream C#

using System;
using System.IO;
class Test 
{
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";
        if (!File.Exists(path)) 
        {
            using (StreamWriter sw = File.CreateText(path)) 
            {
                sw.WriteLine("Hello");
                sw.WriteLine("And");
                sw.WriteLine("Welcome");
            }  
        }
        using (StreamReader sr = File.OpenText(path)) 
        {
            string s = "";
            while ((s = sr.ReadLine()) != null) 
            {
                Console.WriteLine(s);
            }
        }
        string path2 = path + "temp";
        File.Delete(path2);
        File.Copy(path, path2);
        Console.WriteLine("{0} was copied to {1}.", path, path2);
        File.Delete(path2);
        Console.WriteLine("{0} was successfully deleted.", path2);
    }
}