Query based on a selection from a combo box

Hi,
i have a search.jsp form with some input fields. One of the input fields is a combo box, filled with information from a database. Now I want to query the database with the option selected in the combo.
This is the code of the combo box:     
<select name="ScopeCh">
<option selected value "-1">Select ...</option>
<% while (searchForm2.getScopes() > 0 ) { %>
<option value="<%=searchForm2.getScope()%>">
<%=searchForm2.getScope()%>     
<% } %>
</select>
The query doesn't work when I select a value in the combo box.
Thanks for your help

request.getParameter(ScopeCh)
Should return the Value which was selected from Combo Box

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