protected void itemNameDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
int itemNo = Convert.ToInt32(itemNameDropDownList.SelectedValue);
reorderLevelTextBox.Text = aStockInManager.GetReOrderLevel(itemNo).ToString();
availableQuantityTextBox.Text = (aStockInManager.GetAvailableQuantity(itemNo)).ToString();
}