public void InsertDetails()
        {
            string  invno     = Request["invno"];
            int     prodid    = Convert.ToInt32(Request["prodid"]);
            int     qty       = Convert.ToInt32(Request["qty"]);
            decimal unitpx    = Convert.ToDecimal(Request["unitpx"]);
            string  prodname  = Request["prodname"];
            string  imeiList  = Request["imei"];
            string  invstatus = Request["invstatus"];
            decimal discount  = Convert.ToDecimal(Request["discount"]);
            //
            SalesDetails instance = new SalesDetails();

            instance.InvNo     = invno;
            instance.ProdID    = prodid;
            instance.Qty       = qty;
            instance.UnitPx    = unitpx;
            instance.ProdName_ = prodname;
            instance.IMEI_     = imeiList;
            instance.Discount  = discount;
            //
            bool isInserted         = true;
            JsonBridge <String> ins = new JsonBridge <String>();

            try
            {
                SalesDetails.InsertSalesDetails(instance, invstatus);
            }
            catch (Exception)
            {
                isInserted = false;
            }

            ins.Valid = isInserted == true ? 1 : 0;

            string output = JsonConvert.SerializeObject(ins);

            Response.Write(output);
        }