Recordset er tomt????

<%
    txtusername = Request.Form(\"txtusername\")
    txtpassword = Request.Form(\"txtpassword\")
   
    \'Opprette connection objekt
    Set oConn = Server.CreateObject(\"ADODB.Connection\")

    \' Logge inn i databasen
    oConn.Open \"Driver={Microsoft Access Driver (*.mdb)};dbq=\" & Server.MapPath(\"database/userlevel.mdb\")

    SQL = \"SELECT User,Password,SecurityLevel FROM Users WHERE User =\'\" & txtusername & \"\' AND Password=\'\" & txtpassword & \"\'\"
    Set oRS = oConn.Execute(SQL)
       
    If oRS(\"SecurityLevel\") = 0 Then
        Response.Write \"Du har ikke tilgang\"
   
    ElseIf oRS(\"SecurityLevel\") = 1 Then
        Response.Write \"Du hadde userlevel 1\"
       
    ElseIf oRS(\"SecurityLevel\") = 2 Then
        Response.Write \"Du hadde userlevel 2\"
   
    ElseIf oRS(\"SecurityLevel\") = 3 Then
        Response.Write \"Du hadde userlevel 3\"
       
    End If

    \' Lukke connection objekt
    oConn.Close

    \' Frigi minnet
    Set oConn = Nothing   
%>

Hva skal jeg skrive hvis brukeren finnes elle recordsetet er tomt så brukeren får en feilmelding?