access rs.recordcount，怎么会得到-1？

Dim ebfs
Set ebfs = Server.CreateObject("ADODB.Recordset")
ebfs.ActiveConnection = conn
ebfs.Source = "SELECT id from goods where lei=1 ORDER BY ID DESC"
ebfs.CursorType = 0
ebfs.CursorLocation = 2
ebfs.LockType = 1
ebfs.Open()

if not ebfs.eof then
response.write ebfs.recordcount
maxnum=ebfs.RecordCount
end if


为什么总是输出 －1？？

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thanks