private void Reconcile(ListInventoryItemViewModel model)
 {
     const string uri = "/views/ReconcileGenerics/ReconcileGenerics.xaml";
     ProductId = model.Id;
     NavigateCommand.Execute(uri);
 }
 public void AddLineItem(Guid productId, string productdescription, int qty)
 {
     if (LineItems.Any(p => p.Id == productId))
     {
         var liupdate = LineItems.First(p => p.Id == productId);
         liupdate.Quantity = qty;
     }
     else
     {
         ListInventoryItemViewModel li = new ListInventoryItemViewModel
         {
             Quantity = qty,
             Id = productId,
             ProductDescription = productdescription
         };
         LineItems.Add(li);
     }
 }