private void ItemComboBox_SelectedIndexChanged_1(object sender, EventArgs e) { StockOut stockOut = new StockOut(); Item item = new Item(); stockOut.ItemID = Convert.ToInt32(itemComboBox.SelectedValue); item = _stockOutManager.GetFieldData(stockOut); if (item.ReorderLevel != null || item.AvailableQuantity != null) { reOrderLevelTextBox.Text = item.ReorderLevel.ToString(); availableQuantityTextBox.Text = item.AvailableQuantity.ToString(); } else { reOrderLevelTextBox.Text = "0"; availableQuantityTextBox.Text = "0"; } }