Hi,

If we can look at into below code

        [HttpPost]
        public ActionResult SaveOrder()
        {
            string fileName;
            string result = "Error! Order Is Not Complete!";
            {
                using (var dbContextTransaction = db.Database.BeginTransaction())
                {
                    try
                    {
                        // Get uploaded files from Request object.
                        if (Request.Files.Count > 0)
                        {
                            for (int i = 0; i < Request.Files.Count; i++)
                            {
                                HttpPostedFileBase postedFile = Request.Files[i];
                                ....... 
                            }
                        }
                        result = "Success! Order Is Complete!";
                    }
                    catch (Exception ex)
                    {
                        dbContextTransaction.Rollback();
                        return Json(result, JsonRequestBehavior.AllowGet);
                    }
                } 
            } 
            return Json(result, JsonRequestBehavior.AllowGet);
        }

it was returning like below if there is any error Error! Order Is Not Complete!

Instead of that i need to throw an exception what exception i raised

catch (Exception ex)
{
    dbContextTransaction.Rollback();
    return Json(result, JsonRequestBehavior.AllowGet);
}