protected void itemDropDownList_TextChanged(object sender, EventArgs e) { reorderTextBox.Text = aItemManager.GetReorderByItemId(Convert.ToInt32(itemDropDownList.SelectedValue)).ToString(); Stock aStock = new Stock(); aStock = aStockManager.GetAStockByItemId(Convert.ToInt32(itemDropDownList.SelectedValue)); availableTextBox.Text = aStock.Quantity.ToString(); }