using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        var fileName = "filename.txt";

        // CREATE a file in your Sandbox using .NET Fiddle 

        WriteFile(fileName);

        // READ an existing file in your Sandbox using .NET Fiddle

        var s = ReadAllText(fileName);

        Console.Write(s);

    }

    public static void WriteFile(string path)

    {

        File.WriteAllText(path, ".NET Fiddle is AWESOME!!!");

    }

    public static string ReadAllText(string path)

    {

        return File.ReadAllText(path);

    }

}