Encoding (Read/Write)

using System.IO;

namespace EncodingTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Encoding encoding = Encoding.GetEncoding(860);
            string content = "Não há de quê.";
            File.WriteAllText("output.txt", content, encoding);

            // read the content correctly
            string readContent = File.ReadAllText("output.txt", Encoding.UTF8);

            // faulty reading
            string faultyReadContent = File.ReadAllText("output.txt", encoding);

            Console.WriteLine(readContent);
            Console.WriteLine(faultyReadContent);

            Console.ReadLine();
        }
    }
}