OleDbConnection cn = new OleDbConnection("provider=microsoft.Jet.Oledb.4.0 ; data source=" + Server.Mappath(ConfigurationSettings.AppSettings["DataUrl"]));
</appSettings>
调用的时候 : Public Conn As New OleDbConnection(ConfigurationSettings.AppSettings("MyConn") & Server.mapPath(ConfigurationSettings.AppSettings("DataUrl")))