private void OrderList_listbox_SelectedIndexChanged(object sender, EventArgs e)
 {
     try
     {
         if (OrderList_listbox.SelectedIndex >= 0)
         {
             Order = (ProductOrderRequest)OrderList_listbox.SelectedItem;
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message, "Warning");
     }
 }
 public void newOrder(int initQuantity, string initDiscription, string initOrderStatus, int initID)
 {
     ProductOrder = new ProductOrderRequest(0, initQuantity, initDiscription, initOrderStatus, initID);
     ProductOrderRequests.Add(ProductOrder);
 }