winforms - Refreshing a specific instance of a form from another form in vb.net -

ok, google-fu may weak, i'm having issue seems should pretty easy past, try not working. , have special case makes many examples not relevant application.

here's i'm trying do: have listbox on form1 populated database. have button on form1 opens form2 user can enter date , time. date , time, plus additional info, written database, , form2 closes.

what i'm wanting have write or close event on form2 cause refresh of info in listbox in form1.

the 1 major consideration user might have 20+ instances of form1 opened @ 1 time. want refresh form1 spawned it.

i have many buttons on form1 correctly refresh listbox following code:

private sub refreshtimeline()      timelinelistbox.items.clear()      try         myconnection.connectionstring = connstring         myconnection.open()         dim str string         str = "select tleventtime,tleventnotes timeline eventid = '" & eventid & "'"         dim cmd5 oledbcommand = new oledbcommand(str, myconnection)         dr = cmd5.executereader()         while dr.read()             dim eventtime = dr("tleventtime").tostring             dim eventnotes = dr("tleventnotes")             dim tl = "[" & eventtime & "] - " & eventnotes & ""             timelinelistbox.items.add(tl)         end while         myconnection.close()     catch exerror systemexception         msgbox("an error occurred. " & exerror.message)         myconnection.close()     end try  end sub 

in short, proc run when form2 closes, user see changes in listbox. on right form1 (not hurt refresh form1's, number of users have, , number of form1's have open, db hit concern). working i've tried making proc public, , calling form2. , though vs 2010 thought good, , seemed linking correctly, doesn't trigger proc.

what you, great , mighty stackoverflow?