Google reCAPTCHA for MVC 4 and 5

Create a new account. - DEMO

Quick Started

reCAPTCHA Nuget Package

PM> Install-Package reCAPTCH.MVC

After install set key in the appSettings section of your web.config file.

Add Recaptcha in your view.

@using reCAPTCHA.MVC
@using (Html.BeginForm())
{
    @Html.Recaptcha()
    @Html.ValidationMessage("ReCaptcha")
    <input type="submit" value="Register" />
}

Verifying the user's response

[HttpPost]
[CaptchaValidator]
public ActionResult Index(RegisterModel registerModel, bool captchaValid)
{
    if (ModelState.IsValid)
    {
    }
    return View(registerModel);
}