ASP.Net c# -访问动态生成的列表控件

根据数据库中字段'type'的值，我想生成一个CheckBoxList(如果'type'是C)或一个RadioButtonList(如果'type'是R)，然后相应地填充它们。我已经设法创建了必要的控件，但是，在populateAnswers方法中，我不确定如何访问新创建的控件。您可以从下面的代码中看到，我尝试了

((CheckBoxList)this.FindControl("cblAnswers"))

但这不起作用。如有任何帮助，我将不胜感激。

代码:

protected void Button1_Click(object sender, EventArgs e)
{
    string connStr = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;
    MySqlConnection conn = new MySqlConnection(connStr);
    MySqlDataReader reader;
    List<string> listOfAnswerIDs = new List<string>();
    List<string> listOfAnswers = new List<string>();
    List<string> listOfCorrectAnswerIDs = new List<string>();
    try
    {
        conn.Open();
        string cmdText = "SELECT * FROM questions_m WHERE question_id=1";
        MySqlCommand cmd = new MySqlCommand(cmdText, conn);
        reader = cmd.ExecuteReader();
        if (reader.Read())
        {
            lblQuestion.Text = reader["question"].ToString();
            if (reader["type"].ToString().Equals("C"))
            {
                CheckBoxList cblAnswers = new CheckBoxList();
                Page.Form.Controls.Add(cblAnswers);
            }
            else if (reader["type"].ToString().Equals("R"))
            {
                 RadioButtonList rblAnswers = new RadioButtonList();
                 Page.Form.Controls.Add(rblAnswers);
            }
            ViewState["QuestionID"] = reader["question_id"].ToString();
            reader.Close();
            string cmdText2 = "SELECT * FROM answers_m WHERE question_id=1";
            MySqlCommand cmdAnswers = new MySqlCommand(cmdText2, conn);
            reader = cmdAnswers.ExecuteReader();
            while (reader.Read())
            {
                listOfAnswerIDs.Add(reader["answerswer_id"].ToString());
                listOfAnswers.Add(reader["answerswer"].ToString());
                if (reader["correct"].ToString().Equals("Y"))
                {
                    listOfCorrectAnswerIDs.Add(reader["answerswer_id"].ToString());
                }
            }
            reader.Close();
            populateAnswers(listOfAnswers, listOfAnswerIDs);
        }
        else
        {
            reader.Close();
            lblError.Text = "(no questions found)";
        }
        ViewState["listOfCorrectAnswerIDs"] = listOfCorrectAnswerIDs;
    }
    catch
    {
        lblError.Text = "Database connection error - failed to read records.";
    }
    finally
    {
        conn.Close();
    }
}
private void populateAnswers(List<string> listOfAnswers, List<string> listOfAnswerIDs)
{
    Random ran = new Random(Guid.NewGuid().GetHashCode());
    var numbers = Enumerable.Range(1, listOfAnswers.Count).OrderBy(j => ran.Next()).ToList();
    List<ListItem> ans = new List<ListItem>();
    for (int i = 0; i < listOfAnswers.Count; i++)
    {
        ans.Add(new ListItem(listOfAnswers[i].ToString(), listOfAnswerIDs[i].ToString()));
    }
    foreach (int num in numbers)
    {
        ((CheckBoxList)this.FindControl("cblAnswers")).Items.Add(ans[num - 1]);
    }
}

CheckBoxList cblAnswers = new CheckBoxList();
cblAnswers.ID = "cblAnswers";
Page.Form.Controls.Add(cblAnswers);
RadioButtonList rblAnswers = new RadioButtonList();
rblAnswers.ID = "rblAnswers";
Page.Form.Controls.Add(rblAnswers);