public string ServiceHealthCheck()
        {
            ResultClassString res = new ResultClassString();
            res.result = "ok";
            JavaScriptSerializer js = new JavaScriptSerializer();
            string JsonRespond = js.Serialize(res);

            return JsonRespond;
        }
        public string ServiceDigitofPI(string jSonData)
        {
            try
            {
                JObject j = JObject.Parse(jSonData);

                int i = 0;
                int[] array = new int[2];
                array[1] = 0;
                foreach (var element in j.Properties())
                {
                    array[i] = Convert.ToInt32(element.Value);
                    i++;
                }
                if (array[1] != 0) return "Please enter only one variable including Json Request";
                if (array[0] < 1) return "Please enter the number which is greater than zero";

                string pi = findNthDigitofPI(array[0]);
                ResultClassString res = new ResultClassString();
                res.result = pi;
                JavaScriptSerializer js = new JavaScriptSerializer();
                string JsonRespond = js.Serialize(res);

                return JsonRespond;
            }
            catch (Exception ex) {
                return ex.Message;
            }
        }