Enodage Ascii pour les caractère unicode: à revoir

using System;
using System.Text;
 
class ExAsciiEnc
{
    public static void Main()
    {
        ASCIIEncoding ascii = new ASCIIEncoding();
 
        String unicodeString ="Pi (u03a0) et Sigma (u03a3).";
 
        int indexDePi = unicodeString.IndexOf("u03a0");
        int indexDeSigma = unicodeString.IndexOf("u03a3");
 
        Byte[] encodedBytes = ascii.GetBytes(unicodeString);
        foreach (Byte b in encodedBytes)
        {
            Console.WriteLine("[{0}]", b);
        }
 
        String decodedString = ascii.GetString(encodedBytes);
        Console.WriteLine(decodedString);
    }
}