public virtual ActionResult ChangePassword()
        {
            var viewModel = new ChangePasswordViewModel
                            {
                                MinRequiredNonAlphanumericCharacters = _userService.Settings.MinRequiredNonAlphanumericCharacters,
                                MinRequiredPasswordLength = _userService.Settings.MinRequiredPasswordLength
                            };

            return View(viewModel);
        }
        public virtual ActionResult ChangePassword(ChangePasswordViewModel model)
        {
            if (ModelState.IsValid)
            {
                var changePasswordSucceeded = _userService.ChangePassword(User.Identity.Name, model.OldPassword,
                                                                          model.NewPassword);

                if (changePasswordSucceeded) return RedirectToAction("ChangePasswordSuccess");

                ModelState.AddModelError("", "The current password is incorrect or the new password is invalid.");
            }

            // If we got this far, something failed, redisplay form
            return RedirectToAction("ChangePassword");
        }