Recaptcha Validations on C# asp.net

[Jose Reinoso rodriguez]

Hi,

I'm trying to implement the validation for the recaptcha but i do not see any guide where i can follow to meet with validation in asp.net C#.

Can someone help me please.

[Seth Munroe]

I use the following:

        /// <summary>

        /// This value will be true if the user passes the test or if the test is unable

        /// to run for any reason.

        /// </summary>

        private bool UserIsHuman

        {

            get

            {

                bool isHuman = true; // assume human until proven otherwise

                lblResult.Text = "";

                // issues in communication with the server will be treated as

                // successful validation.

                try

                {

                    WebClient client = new WebClient();

                    NameValueCollection postParms = new NameValueCollection();

                    postParms.Add("secret", "xxx" );

                    postParms.Add("response", Request.Params["g-recaptcha-response"]);

                    byte[] resp = client.UploadValues("https://www.google.com/recaptcha/api/siteverify", postParms);

                    String respString = Encoding.UTF8.GetString(resp);

                    JavaScriptSerializer jss = new JavaScriptSerializer();

                    dynamic recapVal = jss.DeserializeObject(respString);

                    bool recapSuccess = false;

                    recapSuccess = recapVal["success"];

                    if ((!recapSuccess) ||

                        (!HttpContext.Current.Request.Url.Host.Equals(recapVal["hostname"])) )

                    {

                        isHuman = false;

                    }

                }

                catch (Exception)

                {

                    // ignore it.

                }

                return isHuman;

            }

        }