retrieve text value from ctl00$ContentPlaceHolder1$Colors-116

I create a dropdown box dynamically. It shows like this in the source code
<select name="ctl00$ContentPlaceHolder1$Colors-116" id="ctl00_ContentPlaceHolder1_Colors-116">
<option value="375">red</option> <option value="376">yellow</option> <option value="377">green</option>
</select>
When the button is submitted, how can I get the text value, rather than the numeric value. So I'd like to retrieve 'red' is it's been selected.
I've tried Request.Form("ctl00$ContentPlaceHolder1$Colors-116") but this gives me the numeric value.

thanks