this code in c#?

set RS = Q.CreateRecordSet("nonsequential")
set Q = Server.CreateObject("ixsso.Query")
set util = Server.CreateObject("ixsso.Util")

Q.Catalog = "www.vakantiegenoegens.be" Q.Query = searchstring
Q.SortBy = "rank[d]"
Q.Columns = "DocTitle, vpath, filename, characterization, rank"
Q.MaxRecords = 300

While Not RS.EOF
extension = lcase(getExtension( RS("filename") ))
if extension=".html" or extension=".htm" or extension=".xls" or extension=".doc" or extension=".asp" then
title = RS("DocTitle")
filename = removeExtension( RS("filename"))
path = RS("vpath")
rank = RS("rank")
info = RS("characterization")
RS.MoveNext
loop

what reference must i import? Or what must i do?
I want to yous Index server to search!

many thanks in advance
joekske