public IActionResult AddMaterial([FromForm] ProductMaterial model) { if (ModelState.IsValid) { int isAdded = _workshopRepository.AddMaterialToProduct(model); return(RedirectToAction(nameof(Edit), new { id = model.WSProductId })); } ProductMaterialCreationViewModel model1 = new ProductMaterialCreationViewModel() { ProductMaterial = model, Materials = _workshopRepository.GetAllMaterials(), productId = model.WSProductId }; return(View(model1)); }