AccountController.cs

        [ImportModelStateFromTempData]
        public ActionResult Register()
        {
            return View();
        }

        [HttpPost, ValidateAntiForgeryToken, ValidateModelState]
        public ActionResult Register(RegisterViewModel model)
        {
            var command = _mapper.Map<RegisterCommand>(model);

            try
            {
                _mediator.Send(command);
            }
            catch (ValidationException e)
            {
                ModelStateErrorFactory.AddErrors(ModelState, e.Errors);
            }

            return View();
        }