手动做了个简单列子，希望有所帮助

前台

    <div>
        <asp:CheckBoxList AutoPostBack="true" runat="server" onselectedindexchanged="CheckBoxList1_SelectedIndexChanged">
        <asp:ListItem Value="1">选中</asp:ListItem>
            <asp:ListItem Value="2">未选中</asp:ListItem>      
        </asp:CheckBoxList>

        <asp:Panel runat="server">

        </asp:Panel>
    </div>

后台

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (CheckBoxList1.SelectedValue == "1")
        {
            CheckBoxList che2 = new CheckBoxList();
            ListItem li = new ListItem("选中的时候", "1");
            che2.Items.Add(li);
            Panel1.Controls.Add(che2);
        }
        if (CheckBoxList1.SelectedValue == "2")
        {
            CheckBoxList che2 = new CheckBoxList();
            ListItem li = new ListItem("未选中的时候", "2");
            che2.Items.Add(li);
            Panel1.Controls.Add(che2);
        }
    }