将数据从代码隐藏文件动态加载到中继器中

问题可能有点长：

我正在制作一个在线评估门户网站，数据库中有不同类型的问题，需要以网络形式加载。问题可以是单答案（单选按钮）或多答案（复选框按钮）。因此，根据类型，我根据需要创建单选按钮或复选框，并在运行时将其加载到Repeater中。代码如下：

SqlCommand cmd = new SqlCommand("select * from tbl_QuestionAnswer", con);
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
    if ((string)dr["type"] == "SingleAnswer")
    {
        RadioButton rAnswer1 = new RadioButton();
        rAnswer1.ID = "rbl_Answer1";
        rAnswer1.GroupName = "QAnswer1";
        rAnswer1.Text = dr["Answer1"].ToString();
        Panel PAnswer1 = e.Item.FindControl("PAnswer1") as Panel;
        PAnswer1.Controls.Add(rAnswer1);

        RadioButton rAnswer2 = new RadioButton();
        rAnswer2.ID = "rbl_Answer2";
        rAnswer2.GroupName = "QAnswer1";
        rAnswer2.Text = dr["Answer2"].ToString();
        Panel PAnswer2 = e.Item.FindControl("PAnswer2") as Panel;
        PAnswer2.Controls.Add(rAnswer2);

        RadioButton rAnswer3 = new RadioButton();
        rAnswer3.ID = "rbl_Answer3";
        rAnswer3.GroupName = "QAnswer1";
        rAnswer3.Text = dr["Answer3"].ToString();
        Panel PAnswer3 = e.Item.FindControl("PAnswer3") as Panel;
        PAnswer3.Controls.Add(rAnswer3);

        RadioButton rAnswer4 = new RadioButton();
        rAnswer4.ID = "rbl_Answer4";
        rAnswer4.GroupName = "QAnswer1";
        rAnswer4.Text = dr["Answer4"].ToString();
        Panel PAnswer4 = e.Item.FindControl("PAnswer4") as Panel;
        PAnswer4.Controls.Add(rAnswer4);
    }
    else
    {
        CheckBox cAnswer1 = new CheckBox();
        cAnswer1.ID = "chk_Answer1";
        cAnswer1.Text = dr["Answer1"].ToString();
        Panel PAnswer1 = e.Item.FindControl("PAnswer1") as Panel;
        PAnswer1.Controls.Add(cAnswer1);
        CheckBox cAnswer2 = new CheckBox();
        cAnswer2.ID = "chk_Answer2";
        cAnswer2.Text = dr["Answer2"].ToString();
        Panel PAnswer2 = e.Item.FindControl("PAnswer2") as Panel;
        PAnswer2.Controls.Add(cAnswer2);
        CheckBox cAnswer3 = new CheckBox();
        cAnswer3.ID = "chk_Answer3";
        cAnswer3.Text = dr["Answer3"].ToString();
        Panel PAnswer3 = e.Item.FindControl("PAnswer3") as Panel;
        PAnswer3.Controls.Add(cAnswer3);
        CheckBox cAnswer4 = new CheckBox();
        cAnswer4.ID = "chk_Answer4";
        cAnswer4.Text = dr["Answer4"].ToString();
        Panel PAnswer4 = e.Item.FindControl("PAnswer4") as Panel;
        PAnswer4.Controls.Add(cAnswer4);
    }
}

但这里的问题是所有的答案都包含在所有的问题中。即从dr["Answer1"]获取"Answer1"列中的所有数据，然后制作复选框或单选按钮。我不知道为什么会发生这种情况，因为它应该一次只处理一行，并且只处理该行的数据。

同样，这在两个问题之前运行良好。之后，如果我添加第三个问题并尝试加载它，它会出现错误，说"找到了多个ID为'rbl_Answer1'的控件。FindControl要求控件具有唯一的ID。"。这也是正确的。因此，我需要一种方法来将问题动态加载到web表单中，这取决于单个答案或多个asnwer

while (dr.Read())
{
    if ((string)dr["type"] == "SingleAnswer")
    {
        RadioButton rAnswer1 = new RadioButton();
        rAnswer1.ID = "rbl_Answer" + dr["AnswerID1"].ToString();