DataList里RadioButtonList的取值问题

       RadioButtonList rbtl;
        foreach (DataListItem oDataListItem in DataList1.Items)
        {
            rbtl = (RadioButtonList)oDataListItem.FindControl("Rblselect");
            string a = rbtl.SelectedValue.ToString();
            this.Response.Write("<script>alert('" + a + "')</script>");

        }

下面还有一种方法
        //for (int i = 0; i < DataList1.Items.Count; i++)
        //{
        //    rbtl = (RadioButtonList)DataList1.Items[i].FindControl("Rblselect");
        //    if (rbtl.SelectedItem.Selected)
        //    {
        //        string a = rbtl.SelectedValue.ToString(); this.Response.Write("<script>alert('" + a + "')</script>");
        //    }
        //}