public PurchaseOrderDetailsController(ApplicationDbContext db)
 {
     _db = db;
     PurchaseOrderDetaislVM = new PurchaseOrderDetailsViewModel()
     {
         PurchaseOrderDetail = new Models.PurchaseOrderDetails(),
         isNewProduct        = false,
         vendor = new Vendors()
     };
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="PurchaseOrderDetailsView"/> class.
 /// </summary>
 public PurchaseOrderDetailsView()
 {
     InitializeComponent();
     DataContext = new PurchaseOrderDetailsViewModel();
 }