private void ValidateSeries()
        {
            string prefix  = Request["prefix"];
            string digits  = Request["digits"];
            int    kioskid = Convert.ToInt32(Request["kioskid"]);
            //
            int res = 0;
            JsonBridge <String> ins = new JsonBridge <String>();

            try
            {
                res = Booklet.ValidateSeries(prefix, digits, kioskid);
            }
            catch (Exception)
            {
                res = 0;
            }

            ins.Valid = res;

            string output = JsonConvert.SerializeObject(ins);

            Response.Write(output);
        }