View the HTML of the website and identify the id and values of the dropdownlist, for example:
<select id="bdayMonthId" size="1" name="bdayMonth">
<option value="">Month</>
<option value="Jan">January</>
<option value="Feb">February</>
<option value="Mar">March</>
</select>
To pre-select the dropdownlist value in the WebBrowser control use this Winform code:
webBrowser1.Document.GetElementById("bdayMonthId").SetAttribute("value", "Feb");
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