How to selected drowndown list options in web browser

Hi there,

Im working a web browser automation project. There is an ajax controlled dropdown list in a web site.

It was like this;

<option value="test1">test1</option>
<option value="test2">test2</option>
<option value="test3">test3</option>
<option value="test4">test4</option>
<option value="test5">test5</option>

When i was selected test2 ajax is working and its giving another div. (I need this div)

I use this codes;

<p>webbrowser1.Document.GetElementsByTagName("select")[0].Document.GetElementsByTagName("option")[1].SetAttribute("selected", "selected");</p>

<p></p>

<p>How can i select option 1?</p>

<p>Thanks.</p>