You could just create a DAP with a combobox in the Header and then place the following code on the onchange event. This will just show the records that matches the dropdown selection. But if you must use ASP, then I'm sure someone else will post an answer.
<SCRIPT language=vbscript event=onchange for=fname>
<!--
Dim rs
Set rs = MSODSC.DefaultRecordset
rs.Find "[NameFull] = '" & document.all.item("fname").value & "'", 0, 1, 1
'0 = Skip zero records before starting the search.
'1 = Search in a forward direction.
'1 = Always begin the search with the first record in the recordset.
-->
</SCRIPT>