private void AddButtonClick()
        {
            if (string.IsNullOrWhiteSpace(ItemNameTextBox) || string.IsNullOrWhiteSpace(ItemPriceTextBox))
            {
                MessageBox.Show("Please enter all values");
                return;
            }

            Order order = new Order()
            {
                Name   = ItemNameTextBox,
                Price  = Convert.ToDecimal(ItemPriceTextBox),
                IsPaid = IsPaid
            };

            SaveToFile save = new SaveToFile();

            if (!save.ToCsv(order))
            {
                MessageBox.Show("Error while saving\n" + save.ErrorCode);
            }
            else
            {
                MessageBox.Show("Order Saved");
                save = null;
            }
        }