How can I check any of radio button is not selected
<p>I want to check whether any of radio button is not checked.How can I do it?</p>

<pre><code>    $(document).ready(function(){

     $('#delete_btn').click(function(){ as answer
         if ( !($("RadioGroup1").is(':checked')) )// THis line is not wirking..I need the code for this line
{ 


             }else{
//message
        }
</code></pre>
