public ActionResult GetReceiptNo() { dynamic receiptNo = 0; try { if (ModelState.IsValid) { SaleServiceClient service = new SaleServiceClient(); receiptNo = service.GetReceiptNo(); //return Json(invNo, JsonRequestBehavior.AllowGet); } } catch (Exception ex) { ModelState.AddModelError("error", "Something Went Wrong"); receiptNo = null; throw ex; } return(Json(receiptNo, JsonRequestBehavior.AllowGet)); }