数据库连接问题！

set conn=Server.CreateObject("ADODB.Connection")
connstr=server.mappath("intelnetdy.mdb")
conn.open "driver={microsoft access driver(.mdb)};"&connstr&";"&"user=sa"
不能用行！为什么？
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set conn=Server.CreateObject("ADODB.Connection")
db="intelnetdy.mdb"
connstr="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(""&db&"")
conn.open connstr