private async Task AspUserCredentials(LoginModel model)
        {
            var ticket = await _authorizeService.GetAuthenticateTicketAsync(model.username, model.password);

            if (ticket == null)
            {
                _authorizeModel.SetError("username_password_error", "Invalid username or password");
                _authorizeModel.Rejected();
                return;
            }
            _authorizeModel.Validated(ticket);
            return;
        }