public RedirectToRouteResult AddItem(BillingViewModel mdl)
{
InvoiceItem i = new InvoiceItem();
int? id = db.InvoiceItem_IdMax().First();
i.id = (int)id + 1;
i.invoiceId = mdl.InvoiceItem.invoiceId;
i.pid = mdl.Product.pid;
i.iid = mdl.Inventory.iid;
i.quantity = mdl.InvoiceItem.quantity;
i.free = mdl.InvoiceItem.free;
db.InvoiceItems.Add(i);
Inventory inv = db.Inventories.SingleOrDefault(x => x.iid == i.iid);
inv.quantity -= (i.quantity + i.free);
db.SaveChanges();
//return PartialView("_InvoiceAddItem", mdl);
return(RedirectToAction("GenerateInvoice", new { id = mdl.InvoiceItem.invoiceId }));
}
