【CheckBoxList】 换成【CheckBox】 下面的代码该如何修改

 SqlDataReader sdr = cmd.ExecuteReader();            while (sdr.Read())            {                Literal littxt = new Literal();                Literal litti = new Literal();                //CheckBoxList che = new CheckBoxList();//复选框多选择                CheckBoxList cbk = new CheckBoxList();                                              littxt.Text = "<input type='hidden' name='db_" + bie.ToString() + "'  id='db_" + bie + "' value='' answer='" + Server.HtmlEncode(sdr["rightAns"].ToString()) + "'/>" + "<div class='result' id='result_" + bie.ToString() + "' >" + i.ToString() + "、" + Server.HtmlEncode(sdr["testContent"].ToString());                litti.Text = "</div>";                littcookie["littxt"] += HttpUtility.UrlEncode(littxt.Text + "|");                littcookie["acbk"] += HttpUtility.UrlEncode(sdr["testAns1"].ToString()) + "|";                littcookie["bcbk"] += HttpUtility.UrlEncode(sdr["testAns2"].ToString()) + "|";                littcookie["ccbk"] += HttpUtility.UrlEncode(sdr["testAns3"].ToString()) + "|";                littcookie["dcbk"] += HttpUtility.UrlEncode(sdr["testAns4"].ToString()) + "|";                cbk.Items.Add("A. " + Server.HtmlEncode(sdr["testAns1"].ToString()));                cbk.Items.Add("B. " + Server.HtmlEncode(sdr["testAns2"].ToString()));                cbk.Items.Add("C. " + Server.HtmlEncode(sdr["testAns3"].ToString()));                cbk.Items.Add("D. " + Server.HtmlEncode(sdr["testAns4"].ToString()));                               cbk.Font.Size = 11;                                for (int j = 1; j <= 4; j++)                {                    cbk.Items[j - 1].Attributes.Add("onclick", " db(" + bie.ToString() + ", " + num++ + ")");//给input标签加事件                                   }                num = 1;                bie++;                Ans += sdr[6].ToString();                if (Session["a"] == null)                {                    Session["Ans"] = Ans;                }                cbk.Attributes.Remove("name");                Panel1.Controls.Add(littxt);                Panel1.Controls.Add(cbk);                Panel1.Controls.Add(litti);                i++;                tNUM++;            }