格式列表框中的C＃2 bindingList

Question

我正在尝试将第二个BindingList添加到ListBox但无法弄清楚如何。这是我的代码。

private Entitycontext context = new Entitycontext();
private BindingList<TblProduct> products = new BindingList<TblProduct>(); 
private BindingList <TblProductItem> SubProduct = new BindingList <TblProductItem>();

public form1()
{
   InitializeComponent();
   // here in listbox i want to add the second BindingList but I don't Know how??
   // Could some One help me with this please..
   ListBox.DataSource = Products;
}

/// here the listbox is format as FormaLIstItem
private void FormaLIstItem(object sender, ListControlConvertEventArgs e)
{
   string currentDescription = ((TblProduct)e.ListItem).Description.PadRight(25);
   string currentPrice = string.Format("{0:C}"((TblProduct)e.ListItem).Price).PadRight(25);
   e.Value =  currentDescription + currentPrice;
   string currentDescriptions = ((TblProductItem)e.Value).Description.PadRight(25);
   string currentPrices = string.Format("{0:C}",((TblProductItem)e.Value).Price).PadRight(25);
   e.Value =  currentDescriptions + currentPrices;
}