با سلام

 من قصد دارم از reCaptcha گوگل در پروژه ام استفاده کنم.

این partial view من هست:

@model VaraminNameh.Areas.Admin.Models.Comment

@using (Html.BeginForm("SaveComment", "NewsList", FormMethod.Post, new {@id="myform" }))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        @Html.HiddenFor(model => model.NewsListID)
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2 col-xs-12" })
            <div class="col-md-10 col-xs-12">
                @Html.TextAreaFor(model => model.Description, new { rows = "5", @class = "col l12", @required = "required" })
                @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
            </div>
            <div class="col l12 center">
                <div class="g-recaptcha center" data-sitekey="6LdrZjgUAAAAAOvR4ENhn7MlPl5qLczEm3bkgmCN"></div>
                <span class="text-danger">@ViewBag.CaptchaErrorMessage </span>
            </div>

        </div>

        <div class="form-group">
            <div class="col l2"></div>
            <div class="col s12 center">
                <input type="button" value="ثبت نظر" class="btn center btn-default"
                       onclick="Save(@Model.NewsListID,$('#myform').val())" />
            </div>
        </div>
    </div>
}

 و این هم کد :

 public ActionResult SaveComment(int pageID,string comment,FormCollection form)
        {    
 
            string urlToPost = "https://www.google.com/recaptcha/api/siteverify";
            string secretKey = "6LdrZjgUAAAAAGB-Cj-cVyUuxxCaXk9Y8KN8s7IT"; // change this
            string gRecaptchaResponse = this.Request.Form["g-recaptcha-response"];

            var postData = "secret=" + secretKey + "&response=" + gRecaptchaResponse;

            // send post data
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlToPost);
            request.Method = "POST";
            request.ContentLength = postData.Length;
            request.ContentType = "application/x-www-form-urlencoded";

            using (var streamWriter = new StreamWriter(request.GetRequestStream()))
            {
                streamWriter.Write(postData);
            }

            // receive the response now
            string result = string.Empty;
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                using (var reader = new StreamReader(response.GetResponseStream()))
                {
                    result = reader.ReadToEnd();
                }
            }

            // validate the response from Google reCaptcha
            var captChaesponse = JsonConvert.DeserializeObject<reCaptchaResponse>(result);
            if (!captChaesponse.Success)
            {
                ViewBag.CaptchaErrorMessage = "Sorry, please validate the reCAPTCHA";
                return View();
            }
}

 اما مشکل اینجاست که this.Request.Form["g-recaptcha-response"] همیشه nullهستش. این رو باید چطور ست کنم؟؟؟

متشکرم