Web Forms :: Get Selected Value Of RadioButtonList Inside Repeater Control

I have added a RadioButtonList inside a repeater as follows:

(.aspx file):

<asp:Button ID="Button1" Text="Add Comment" runat="server" />
<asp:Panel ID="pnlPanelDemo" runat="server" CssClass="modalPopup" ViewStateMode="Disabled">
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</cc1:ToolkitScriptManager>
<asp:Repeater ID="rptComments" runat="server">

[Code] ....

Now suppose if 3 questions are displayed on the webpage then 3 radiobuttonlists are displayed. I need to send the selected text of radiobuttons separately in my table in SQL Server on a button click event.

Suppose if selected answers are Very Poor, Average and Good then database entry should look like:

1         Very Poor
2         Average
3         Good

(.aspx.cs file)

protected void AddComment(object sender, EventArgs e) {           
string constr = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
string sqlStatment = "INSERT INTO FeedbackResponse(QUESTION_ID,RESPONSE) values(@QID,@RESP)"; 
using (SqlConnection con = new SqlConnection(constr)) { 
using (SqlCommand cmd = new SqlCommand(sqlStatment, con)) { 
con.Open();  cmd.Parameters.AddWithValue("@RESPONSE",this.rptComments.   
cmd.ExecuteNonQuery();  con.Close();               
} }

I am not sure what to do in the bold line.