public IActionResult Create(Medicine medicine, int?Id) { if (Id == null) { if (ModelState.IsValid) { _context.Add(medicine); _context.SaveChanges(); return(RedirectToAction("Index")); } } else { if (ModelState.IsValid) { _context.Update(medicine); _context.SaveChanges(); return(RedirectToAction("Index")); } } return(View(medicine)); }