how can I pass control value from parent window to popup window's code behind
<p>I want to receive value from parent's control to popup window's <strong>code behind.</strong></p>

<p>for example</p>

<pre><code>&lt;asp:RadioButton ID="rdoRate" GroupName="CouponType" value="0" runat="server" checked/&gt;Rate
&lt;asp:RadioButton ID="rdoAmount" GroupName="CouponType" value="1" runat="server"/&gt;dollar
</code></pre>

<p>and recive selected radiobutton's value from popup window's code behind.</p>

<p>My Solution is  make querystring  and  pass the value.</p>

<p>for example >   </p>

<pre><code>window.open(url + ?selectedRadioVal=" + $("#~~checkedradiovalue~~) .. blah balh)
</code></pre>

<p>and receive the value by  <code>Reqeust.Querystring.Get()</code>.</p>

<p>But I can't send very long string.  (maybe the url length is limited, right?)</p>

<p>Is there any good way to solve ?</p>
