private byte[] GetSaltedPassword(string password, string salt)
    {
      byte[] passwordBuff = Encoding.Unicode.GetBytes(password);
      byte[] saltBuff = Convert.FromBase64String(salt);
      byte[] saltedPassword = new byte[saltBuff.Length + passwordBuff.Length];
      Buffer.BlockCopy(saltBuff, 0, saltedPassword, 0, saltBuff.Length);
      Buffer.BlockCopy(passwordBuff, 0, saltedPassword, saltBuff.Length, passwordBuff.Length);
      return saltedPassword;
    }

    private string GetEncodedPassword(string password, int passwordFormat, string passwordSalt)
    {
      string encodedPassword;
      byte[] buff;
      byte[] saltedPassword;

      switch (passwordFormat)
      {
        case 0:
          encodedPassword = password;
          break;
        case 1:
          saltedPassword = GetSaltedPassword(password, passwordSalt);
          HashAlgorithm hashAlgorithm = HashAlgorithm.Create(Membership.HashAlgorithmType);
          buff = hashAlgorithm.ComputeHash(saltedPassword);
          encodedPassword = Convert.ToBase64String(buff);
          break;
        default:
          saltedPassword = GetSaltedPassword(password, passwordSalt);
          buff = EncryptPassword(saltedPassword);
          encodedPassword = Convert.ToBase64String(buff);
          break;
      }