how to manipulate a combobox in a webpage using webbrowser control

[linezero]

I was wondering how can I select and change values of a combo box of a web page if i have the id for the combo box.

if the combobox1.text has 1 then I can select 1 from the web page combo box

the html code is:

<tr>
<td  width="50%"><b>Numbers</b></td>
<td  width="50%"><select id="num" name="num" style="width: 80%">
<option value="1.php">Page 1</option>
<option value="2.php">Page 2</option>            
</select>
</td>    
</tr>