DataList 嵌套 DataGrid 供参考

刚写好的 DataList 嵌套 DataGrid 供参考
前台：
<asp:datalist id="DataList1" runat="server" Width="545" RepeatDirection="Horizontal" RepeatColumns="2"
     DataKeyField="classid" OnItemDataBound="BoundData" HorizontalAlign="Center">
     <ItemTemplate>
      <table cellpadding="0" cellspacing="1" border="0" bgcolor="#cccccc">
       <tr>
        <td bgcolor="#ffffff"><%# DataBinder.Eval(Container.DataItem, "classname") %></td>
       </tr>
       <tr>
        <td bgcolor="#ffffff" width="255" height="150" valign="top">
         <asp:DataGrid ID="DataGrid1" AutoGenerateColumns="False" ShowHeader="False" ShowFooter="False"
          Border="0" EnableViewState=False Runat="server">
          <Columns>
           <asp:BoundColumn DataField="title"></asp:BoundColumn>
          </Columns>
         </asp:DataGrid>
        </td>
       </tr>
       <tr>
        <td bgcolor="#ffffff" align="right"><a href='list.aspx?classid=<%# DataBinder.Eval(Container.DataItem,"classid")%>'>更多新闻...</a></td>
       </tr>
      </table>
      <br>
     </ItemTemplate>
    </asp:datalist>

.asp.cs

  private void Page_Load(object sender, System.EventArgs e)
  {
   if(!IsPostBack)
   {
    getClassItem();
   
   }
  }
  private void getClassItem()
  {
   string con=ConfigurationSettings.AppSettings["dsn"];
   SqlConnection conn=new SqlConnection(con);
   conn.Open();
   SqlCommand comm=new SqlCommand("select * from db_fClass order by classid ",conn);
   SqlDataReader rd;
   rd=comm.ExecuteReader();
   DataList1.DataSource=rd;
   DataList1.DataBind(); 
   rd.Close();
   conn.Close();
  }

  protected void BoundData(object sender,DataListItemEventArgs e)
  {
   if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem)
   {
    DataGrid dg=(DataGrid)e.Item.FindControl("DataGrid1");
    string index=this.DataList1.DataKeys[e.Item.ItemIndex].ToString();
    string con=ConfigurationSettings.AppSettings["dsn"];
    SqlConnection conn=new SqlConnection(con);
    conn.Open();
    SqlCommand comm=new SqlCommand("select top 4 * from db_Article where classid="+index,conn);
    SqlDataReader rd;
    rd=comm.ExecuteReader();
    dg.DataSource=rd;
    dg.DataBind(); 
    rd.Close();
    conn.Close();
   
   }