public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var currentIngredients = value as BindingList<StockItem> ?? new BindingList<StockItem>();
BindingList<StockItem> allIngredients;
using (var dataStorage = new DataStorage())
allIngredients = dataStorage.StockItems() as BindingList<StockItem> ?? new BindingList<StockItem>();
return allIngredients.ExceptBy(currentIngredients, s => s.ItemName).Select(i => i.ItemName);
}
