System.Data.SQLite

  /// <param name="passwordMode">
  /// The called method may modify this parameter in order to change
  /// which connection string property is used to setup the password.
  /// </param>
  /// <returns>
  /// The password string to use when opening the connection.
  /// </returns>
  public delegate string SQLiteGetPasswordCallback(
      SQLiteConnection connection,  /* in */
      ref PasswordMode passwordMode /* in, out */
  );
#endif

  /////////////////////////////////////////////////////////////////////////////////////////////////

                        _sql.SetPassword(_password, _passwordWasText);
                    }
                    else if (_getPasswordCallback != null)
                    {
                        byte[] passwordBytes;
                        PasswordMode passwordMode = PasswordMode.Password;

                        password = _getPasswordCallback(this, ref passwordMode);

                        switch (passwordMode)
                        {
                            case PasswordMode.None:
                                {
                                    //
                                    // NOTE: Do nothing, ignore password.
                                    //
                                    break;
                                }
                            case PasswordMode.Password:
                                {
                                    passwordBytes = UTF8Encoding.UTF8.GetBytes(password);

                                    _sql.SetPassword(passwordBytes, false);
                                    _passwordWasText = false;
                                    _passwordWasHex = false;
                                    break;
                                }
                            case PasswordMode.HexPassword:
                                {
                                    error = null;

                                    passwordBytes = FromHexString(password, true, ref error);

                                    if (passwordBytes == null)
                                    {
                                        throw new FormatException(
                                            HelperMethods.StringFormat(CultureInfo.CurrentCulture,
                                            "Cannot parse 'HexPassword' property value into byte values: {0}",
                                            error));
                                    }

                                    _sql.SetPassword(passwordBytes, false);
                                    _passwordWasText = false;
                                    _passwordWasHex = true;
                                    break;
                                }
                            case PasswordMode.TextPassword:
                                {
                                    passwordBytes = UTF8Encoding.UTF8.GetBytes(password);

                                    Array.Resize(
                                        ref passwordBytes, passwordBytes.Length + 1);

                                    _sql.SetPassword(passwordBytes, true);
                                    _passwordWasText = true;
                                    _passwordWasHex = false;
                                    break;
                                }
                            case PasswordMode.TextHexPassword:
                                {
                                    error = null;

                                    passwordBytes = FromHexString(password, false, ref error);

                                    if (passwordBytes == null)
                                    {
                                        throw new FormatException(
                                            HelperMethods.StringFormat(CultureInfo.CurrentCulture,
                                            "Cannot parse 'TextHexPassword' property value into byte values: {0}",
                                            error));
                                    }

                                    Array.Resize(
                                        ref passwordBytes, passwordBytes.Length + 1);

                                    _sql.SetPassword(passwordBytes, true);
                                    _passwordWasText = true;
                                    _passwordWasHex = true;
                                    break;