protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
  {
    if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
    {
      DataList DataList2 = e.Item.FindControl("DataList2") as DataList;
      DataList2.DataSource = "...读取数据";
      DataList2.DataBind();
    }
  }