实现后效果如 http://www.66law.cn/user/register_lawyer.aspx

请问：如何得到CheckBoxList中用户所选择项的值？以下是我的做法，请高手解答！
前台：
<asp:repeater id="Repeater1" runat="server">
<ItemTemplate>
<table>
<tr>
<td>
<%# DataBinder.Eval(Container.DataItem,"S_title")%>
</td>
</tr>
<tr>
<td>
<asp:CheckBoxList id="cblaw" runat="server"></asp:CheckBoxList>
</td>
</tr>
</table>
</ItemTemplate>
</asp:repeater>
后台：
private void Page_Load(object sender, System.EventArgs e)
{
if(!Page.IsPostBack)
{
BindReapt();

}
}
private void BindReapt()
{
DataSet ds=obj.GetBspecialty();
Repeater1.DataSource =ds;
Repeater1.DataBind ();
ds.Dispose();
}
private void Repeater1_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e)
{ //绑定checkboxlist
CheckBoxList cb=(CheckBoxList)e.Item.FindControl("cblaw");
DataRowView row=(DataRowView)e.Item.DataItem;
string root=row["S_title"].ToString();
DataSet DS=obj.GetSspecialty(root);
cb.DataSource=DS;
cb.DataTextField="S_title";
cb.DataValueField="S_id";
cb.DataBind();

}

现在问题是怎么样取得用户所选择的项目值?

非常感谢楼上的指点：完整代码如下
private void Button1_Click(object sender, System.EventArgs e)
{
string myfav="";
for(int i=0;i<Repeater1.Items .Count;i++)
{
CheckBoxList mybox=(CheckBoxList)Repeater1.Items[i].FindControl("cblaw");
if(mybox!=null)
{
for(int j=0;j<mybox.Items .Count;j++)
{
if(mybox.Items[j].Selected)
{
myfav+=mybox.Items[j].Text+" ";
}


}
}
}
Response .Write (myfav);

}

这个问题的关键：嵌套数据绑定，怎么取得里边控件及其绑定的值！