using System;

using System.IO;

using System.Text;

public class Program

{

    public static void Main()

    {

        File.WriteAllBytes("Web.config", Encoding.ASCII.GetBytes("blah"));

        // user-controlled

        string path = "Web.config...";

        string sp = Path.GetExtension(path);

        Console.WriteLine("Extension: " + sp);

        if (File.Exists(path)){

            Console.WriteLine(path + " exists");

            byte[] buf = File.ReadAllBytes(path);

            string content = Encoding.ASCII.GetString(buf);

            Console.Write("Read content: " + content);

        }

        else{

            Console.WriteLine(path + " doesn't exist");

        }

    }

}