captcha mvc4

Install-Package CaptchaMvc.Mvc4

[CaptchaMvc.Attributes.CaptchaVerify("Captcha is not valid")]

        [HttpPost]

        public ActionResult Contact(ContactDto model)

        {

            if (ModelState.IsValid)

            {

                var saved = _repository.SaveContact(model);

                var msg = saved ? "Your details are saved." : "Error while saving details.";

                ModelState.AddModelError("", msg);

                return View();

            }

            else

            {

                return View();

            }

        }

@using CaptchaMvc.HtmlHelpers

....code....

<br />@Html.Captcha(3)

<input type="submit" value="Send">