Captcha nuget package is always valid for ASP.NET MVC 5

Question

I installed the captcha plugin and followed the installation instructions. Captcha renders the page perfectly, but when submitting a form, the ModelState.IsValid model is always true no matter what I enter. Obviously, if captcha will not check, then this is not very good for me.

Here is my controller:

        [HttpPost]
    [CaptchaValidation("CaptchaCode", "SampleCaptcha", "Incorrect CAPTCHA code!")]
    public ActionResult Register(AccountModel model)
    {
        if (!ModelState.IsValid)
        {
            // TODO: Captcha validation failed, show error message
        }
        else
        {
            // TODO: Captcha validation passed, proceed with protected action
        }

        return View();
    }

And here is my view:

<link href="@BotDetect.Web.CaptchaUrls.Absolute.LayoutStyleSheetUrl" rel="stylesheet" type="text/css" />

<form class="form-horizointal" action="@Url.Action("Register", "Account")" method="POST">
    <div class="form-group">
        @Html.LabelFor(m => m.FirstName, new { @class = "col-sm-2 control-label" })
        @Html.TextBoxFor(m => m.FirstName, new { placeholder = "First Name"})
        @Html.LabelFor(m => m.LastName, new { @class = "control-label", placeholder = "Last Name" })
        @Html.TextBoxFor(m => m.LastName, new { placeholder = "Last Name" })
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Email, new {@class = "col-sm-2 control-label", placeholder = "Email"})
        @Html.TextBoxFor(m => m.Email, new {placeholder = "Email"})
    </div>
    <div class="form-group">
        @{ MvcCaptcha sampleCaptcha = new MvcCaptcha("SampleCaptcha"); }
        @Html.Captcha(sampleCaptcha)
        @Html.TextBox("CaptchaCode")
    </div>
    <div class="form-group">
        captcha goes here
    </div>
    <div class="form-group">
        <input type="submit" class="btn btn-default" value="Register"/>
    </div>
</form>

Does anyone know why this is not working for me? Thank you for your help!

Answer 1

, . botdetect captcha . , ok, , samplecaptcha.Reset(), Model.IsValid , .

@{
    Layout = null;
    MvcCaptcha sampleCaptcha = new MvcCaptcha("SampleCaptcha");
    sampleCaptcha.Reset();
}

[ ..]

Answer 2

// ,

    public ActionResult RegistrationComp(NewRegistration data, bool captchaValid)
    {
        try
        {
            captchaValid = MvcCaptcha.Validate(data.CaptchaID, data.CaptchaCode, data.CurrentInstanceID);

            MvcCaptcha.ResetCaptcha(data.CaptchaID);

            if (!captchaValid)
                return this.Json("false");
            else
                return this.Json("true");

        }
        catch (Exception ex)
        {
            return this.Json("false");
        }
    }

// RegistrationModel : CaptchaID, CaptchaCode , CurrentInstanceID

//cshtml

MvcCaptchaCaptcha = MvcCaptcha ( "C" );

exampleCaptcha.UserInputID = "CC";

 $.post( "@Url.Action(" RegistrationComp "," Authentication ")", {CaptchaCode: $( "# CC" ). val(), CaptchaID: '@exampleCaptcha.CaptchaId', CurrentInstanceID: '@exampleCaptcha. CurrentInstanceId '}, () {});