Fonction upperCase à la française

Fonction upperCase gérant les accents et caratères spéciaux du français :

/// <summary>
/// Returns a copy of a string in uppercase, without accents
/// </summary>
/// <param name="text">Valid string expression</param>
/// <returns>String converted to uppercase</returns>
public static string upperCase (string text) {
  const string accents = "ÁÀÄÂÉÈËÊÍÌÏÎÓÒÖÔÚÙÜÛŸÇ";
  const string normaux = "AAAAEEEEIIIIOOOOUUUUYC";
  string majuscules = text.ToUpper();
  for (int i = 0; i < accents.Length; i++) {
    majuscules = majuscules.Replace(accents.Substring(i, 1), normaux.Substring(i, 1));
  }
  majuscules = majuscules.Replace("Æ", "AE");
  majuscules = majuscules.Replace("Œ", "OE");
  return majuscules;
}

Et la fonction lowerCase correspondante :

/// <summary>
/// Returns a copy of a string in lowercase, without accents
/// </summary>
/// <param name="text">Valid string expression</param>
/// <returns>String converted to lowercase</returns>
public static string lowerCase (string text) {
  return upperCase(text).ToLower();
}