[求助]Set rs = conn.Execute的问题

<!--#include file="db.asp"-->

<%
validpwd = true

If request.form("submit") <> "" Then

' setup variables
userid = Request.Form("userid")
passwd = Request.Form("passwd")
set conn=Server.CREATEOBJECT("ADODB.CONNECTION")
conn.open(dbConnStr)
Set rs = conn.Execute( "Select * from [admin] where [user_id] = '" & UCASE("userid") & "'")

If not rs.eof then
If ucase(rs("user_pwd")) = ucase(passwd) Then
validpwd = true
Else
validpwd = false
End If
Else
validpwd = false
end if
lev=rs("lev")
user=rs("user_id")
rs.Close
Set rs=Nothing
conn.Close
Set conn=Nothing

If validpwd Then
Session("exemple_status") = "login"
session("lev")=lev
session("u_id")=user
response.redirect "default.asp"
End If

End If
%>


以上是登录的代码,连接的是sql server数据库,就是登录页不行,其它的可以,好像是这行
Set rs = conn.Execute( "Select * from [admin] where [user_id] = '" & UCASE("userid") & "'")
请那位高手指教,谢谢