GoogleCaptha.cs

using System.Net;





    public class GoogleCaptha

    {

        public static bool CheckCaptha(string response)

        {
//var response = Request["g-recaptcha-response"];
            string secretKey = "6LchxNsUAAAAAAM7bgBzOnwGmgVlUyppu6xNbcye";

            var client = new WebClient();

            var result = client.DownloadString($"https://www.google.com/recaptcha/api/siteverify?secret={secretKey}&response={response}");

            dynamic obj = System.Web.Helpers.Json.Decode(result);

            return obj.success;

        

    }

}