c# - How to get data from iframes - 


 <td>    <iframe>      #document        <html>          <body>            <table>              <tbody>                <tr>..<tr>                 <tr>                    <td> <select id="selyear" onchange="document.getelementbyid('selcat').selectedindex=0;   document.g…tedindex=0;document.getelementbyid('frmfindparts').submit();"  name="year">  <option value=""></option>  <option value="2014"></option>                    </td>                 </tr>              </tbody>        </table><body></html></iframe></tr>

i need data inside option value , output 2014.i using c#. need xpath exactly. here code

var html = pageretriever.readfromserver(pqi.url, false);             var htmldoc = new htmldocument();             htmldoc.loadhtml(html);             var tags = htmldoc.documentnode.selectnodes("xpath please"); 

var options = htmldoc.documentnode.selectnodes("//option")                 .select(o => o.attributes["value"].value)                 .tolist();

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