private void btn_Delete(object sender, RoutedEventArgs e)
 {
     if (dg_AllLinkedItems.SelectedItem != null)
     {
         tbl_DetuctInventory di = (tbl_DetuctInventory)dg_AllLinkedItems.SelectedItem;
         DetuctInventory.delete(di);
         dg_AllLinkedItems.ItemsSource = null;
         dg_AllLinkedItems.ItemsSource = DetuctInventory.getAll();
     }
 }
 public Form_LinkKitchenInventory()
 {
     InitializeComponent();
     dg_AllLinkedItems.ItemsSource = DetuctInventory.getAll();
 }