protected void ItemDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
if (ItemDropDownList.SelectedIndex != 0)
{
int companyId = Convert.ToInt32(companyDropDownList.SelectedValue);
string itemName = ItemDropDownList.SelectedItem.ToString();
StockIn stockIn = stockInManager.GetAvailableStock(companyId, itemName);
reorderlevelTextBox.Text = stockIn.ReorderLevel.ToString();
availableQuantityTextBox.Text = stockIn.AvailableQuantity.ToString();
}
}