public ActionResult Create(detailPurchaseOrder detailpurchaseorder) { if (ModelState.IsValid) { db.detailPurchaseOrder.Add(detailpurchaseorder); db.SaveChanges(); return(RedirectToAction("Index")); } ViewBag.product = new SelectList(db.product, "id", "product_name", detailpurchaseorder.product); ViewBag.purchaseOrder = new SelectList(db.purchaseOrder, "id", "description", detailpurchaseorder.purchaseOrder); return(View(detailpurchaseorder)); }