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();
}