can't find control in code behind

 can't find control in code behind "rdAns" while debugging my project.but this 1 page build successfully

defaul.aspx is
<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" Debug="true" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Crude Oil, Crude Oil Prices, Commodity Trading | Crude Experts" %>
<asp:Content ID="Content1" ContentPlaceHolderID="cph1" Runat="Server">
    <div align="center">
        <table width="93%" border="0" cellspacing="0" cellpadding="0">
        
            <tr>
             &n ...