asp.net中使用Repeater嵌套，提交选中的checkbox项。

主要代码，已测试通过。
前台：
<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">

<ItemTemplate>
<ul>
<li>
<%#Eval("DepId")%>
<%#Eval("Name")%></li></ul>
<asp:Repeater ID="Repeater2" runat="server">
<ItemTemplate>
<asp:CheckBox ID="cb" runat="server" Text='<%#Eval("RealName")%>' />
<asp:HiddenField ID="hidId" Value='<%#Eval("UserId")%>' runat="server" />
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
</asp:Repeater>

后台：
protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                CF.Model.Department modelDepartment = new CF.Model.Department();
                CF.BLL.Department bllDepartment = new CF.BLL.Department();
                DataSet ds = bllDepartment.GetAllList();
                Repeater1.DataSource = ds.Tables[0].DefaultView;
                Repeater1.DataBind();
            }
        }

        protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Repeater rp = (Repeater)e.Item.FindControl("Repeater2");
                string id = DataBinder.Eval(e.Item.DataItem, "DepId").ToString(); //取得部门id
                //根据当前部门的id从人员表中查找员工的数据
                CF.Model.Users modelUsers = new CF.Model.Users();
                CF.BLL.Users bllUsers = new CF.BLL.Users();
                DataSet dsUsers = bllUsers.GetList("DepId=" + id);
                rp.DataSource = dsUsers.Tables[0].DefaultView;
                rp.DataBind();
            }
        }

        //提交培训名单
        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            string trainPersonsId="";
            string trainPersonsNames="";

            for (int i = 0; i < this.Repeater1.Items.Count; i++)
            {
                Repeater rptPersons = (Repeater)this.Repeater1.Items[i].FindControl("Repeater2");
                    for (int j = 0; j < rptPersons.Items.Count; j++)
                    {
                        int id = Convert.ToInt32(((HiddenField)rptPersons.Items[j].FindControl("hidId")).Value);
                        CheckBox cb = (CheckBox)rptPersons.Items[j].FindControl("cb");
                        if (cb.Checked)
                        {
                            trainPersonsId += id + ",";
                            trainPersonsNames += cb.Text.Trim() + ",";
                        }
                    }

                //foreach (RepeaterItem item in rptPersons.Items)
                //{
                //    if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
                //    {
                //        CheckBox cb = item.FindControl("cb") as CheckBox;
                //        if (cb.Checked)
                //        {
                //            trainPersonsNames += cb.Text + "|";
                //        }
                //    }
            }
     &

补充：Web开发 , ASP.Net ,