datalist嵌套gridview

想实现的效果是这样的：
类型1
    内容1
    内容2
    内容3
类型2
    内容1
    内容2
    内容3
类型3
    内容1
    内容2
大家能给个例子吗?多谢了!
--------------------编程问答-------------------- 两个同时查出来，内层的先隐藏，加个触发（如加号）再将内层的显示 --------------------编程问答-------------------- 这是一个外层加了分页的datagrid嵌套datalist的一个例子你可以参考一下，基本差不多的（因为外层加了分页，看起来会麻烦点）
<asp:datagrid id="etw_p" runat="server" AutoGenerateColumns="False" GridLines="None" ShowHeader="False" AllowPaging="True"   PageSize="6" OnPageIndexChanged="etw_p_PageIndexChanged" AllowCustomPaging="True" >
          <Columns>
          <asp:TemplateColumn>
            <ItemTemplate>
              <div class="lm"><b><%#Eval("category_name") %></b></div>
              <ul>
                <asp:datalist id="etw_pro" runat="server" datasource='<%# DataBinder.Eval(Container, "DataItem.myrelation") %>' RepeatColumns="2" RepeatLayout="Flow">
                  <itemtemplate>
                    <li>
                      <ol>
                        <li><a href="showproducts.aspx?id=<%#Eval("product_id")%>"><img src="<%#Eval("product_pic") %>" alt="<%#Eval("product_name")%>" width="70" height="74" /></a> </li>
                        <li class="etw_p"><b><%#Eval("product_name") %>:<%#Eval("product_type") %></b>
                         descripción: <%#Eval("product_content") %><br />
                         </li>
                      </ol>
                    </li>
                  </itemtemplate>
                </asp:datalist>
              </ul>
            </ItemTemplate>
          </asp:TemplateColumn>
          </Columns>
             <PagerStyle Mode="NumericPages" CssClass="pager" />
        </asp:datagrid>

protected void BindProduct()
    {
        OleDbConnection constring = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["xkConnStr"].ConnectionString);
        DataSet ds = new DataSet();
        intEndIndex = intStartIndex + etw_p.PageSize;
        string sql1 = "select * from big_category  where category_id >  @startIndex  and category_id <= @endIndex order by category_id ";

        OleDbDataAdapter sda1 = new OleDbDataAdapter(sql1, constring);
        sda1.SelectCommand.Parameters.Add("?", OleDbType.Integer).Value = intStartIndex;
        sda1.SelectCommand.Parameters.Add("?", OleDbType.Integer).Value = intEndIndex;
        sda1.Fill(ds, "biglb");

        string sql2 = "select  product_id,product_name,product_pic,product_type,category_id,mid(product_content,1,198) as product_content from product where category_id > @startIndex and category_id <= @endIndex and tuijian1=1 order by product_id";
        OleDbDataAdapter sda2 = new OleDbDataAdapter(sql2, constring);

        sda2.SelectCommand.Parameters.Add("?", OleDbType.Integer).Value = intStartIndex;
        sda2.SelectCommand.Parameters.Add("?", OleDbType.Integer).Value = intEndIndex;

        sda2.Fill(ds,"product");
        ds.Relations.Add("myrelation", ds.Tables["biglb"].Columns["category_id"], ds.Tables["product"].Columns["category_id"]);
        etw_p.DataSource = ds.Tables["biglb"].DefaultView;
        etw_p.DataBind();
    }

补充：.NET技术 ,  ASP.NET