How to get dynamic radiobuttonlist item selected value?

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ASP.NET

Iwant to do survey.
there is an placeholder(place holder has dynamic created label and dynamic created radiobuttonlist) inside survey usercontrol.I checked how many question are there.

usercontrol-->placeholder-->label and radiobuttonlist(created dynamicly because we dont know how many question are there)
there is no problem up to here Iam getting questions and create label and radiobuttonlist

MySqlCommand command = new MySqlCommand("xxxxx", conn);
command.CommandType = System.Data.CommandType.StoredProcedure;
command.Parameters.Add("@surveyno", MySqlDbType.VarChar).Value = yyy;

conn.Open();

MySqlDataAdapter dAdapter = new MySqlDataAdapter(command);
DataSet dset = new DataSet();
dAdapter.Fill(dset);
MySqlDataReader reader = command.ExecuteReader();


while (reader.Read())
{
Label myLabel = new Label();
RadioButtonList rdr = new RadioButtonList();
rdr.Items.Add(new ListItem("Yes", "1"));
rdr.Items.Add(new ListItem("No", "2"));
rdr.RepeatDirection=System.Web.UI.WebControls.RepeatDirection.Horizontal;
rdr.DataBind();


myLabel.Text = reader["sorular"].ToString();
PlaceHolder1.Controls.Add(myLabel);
PlaceHolder1.Controls.Add(rdr);
PlaceHolder1.Controls.Add(new LiteralControl("
"));



}


but I select answers question one yes question two no etc. click save button it dont find radiobuttonlist in the placeholder.
Code like this

foreach (Control ctrl in this.PlaceHolder1.Controls)
             {


   if (ctrl is RadioButtonList)
                     {

                        string soruid = ((RadioButtonList)ctrl).ID;
                         string puan = ((RadioButtonList)ctrl).SelectedValue;
                         if (puan == null || puan == "")
                           puan = "0";



                     }

           }