protected void itemDropDownList_OnSelectedIndexChanged(object sender, EventArgs e)
{
itemDropDownList.Items.Remove(itemDropDownList.Items.FindByText("Select Item"));
Item = StockOutManager.GetItemById(Convert.ToInt32(itemDropDownList.SelectedValue));
reorderLevelTextBox.Text = Item.ReorderLevel.ToString();
availableQuantityTextBox.Text = Item.Quantity.ToString();
stockOutQuantityTextBox.Text = String.Empty;
}