Error in autopostback of my radiobuttonlist

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C#

ASP.NET

WebForms

RadioButton

hiiiiiii,


I have a radiobutton list in a datalist retrived from the database question and its answers

I retrive the answers in the radiobutton list i do not have any problem so far.

I set the property autopostback =true it works good for the first and second radio button items but there is a problem in the third item.

Below is my datalist and radio button

<asp:DataList ID="datalist_iq" runat="server" DataKeyField="id" BorderColor="Red">
                                <ItemTemplate>

                                    <table border="1">
                                        <tr>
                                            <td>
                                                <asp:Label ID="label_question_head" runat="server" Style="word-wrap: break-word" Width="310px" Height="91px" Font-Bold="true" ForeColor="Maroon">
                                                                    <%#Eval("q_head") %>

                                                </asp:Label>


                                            </td>
                                        </tr>

                                        <tr>

                                            <td rowspan="2">
                                                <asp:RadioButtonList ID="RadioButton1" AutoPostBack="true"  OnSelectedIndexChanged="RadioButton1_SelectedIndexChanged"   DataTextField="a_head" DataValueField="result" runat="server" Visible="true"  >


                                                </asp:RadioButtonList>

                                            </td>
                                        </tr>
                                    </table>


                               </ItemTemplate>
                          </asp:DataList>

and this is the code behind

protected void RadioButton1_SelectedIndexChanged(object sender, EventArgs e)
  {
      Label_result.Text = "good";
    

     


      foreach (DataListItem dli in datalist_iq.Items)
      {


          rblfilteritem = (RadioButtonList)dli.FindControl("RadioButton1");
          foreach (ListItem item in rblfilteritem.Items)
          {
              if (item.Selected)
                  item.Selected = true;
          }
          Label_result.Text = rblfilteritem.SelectedItem.Text;

      }