public ActionResult ProductTypeIndex(int id)//NatureId
        {
            var producttype = new ProductTypeService(_unitOfWork).GetProductTypeListForMaterial(id).ToList();

            if (producttype.Count() == 0)
            {
                ViewBag.PrevLink = Request.UrlReferrer.ToString();
                ViewBag.Message  = "No ProductType found for this section.";
                return(View("~/Views/Shared/NotFound.cshtml"));
            }
            if (producttype.Count() == 1)
            {
                return(RedirectToAction("MaterialIndex", new { id = producttype.FirstOrDefault().ProductTypeId }));
            }
            else
            {
                return(View("ProductTypeIndexForMaterial", producttype));
            }
        }