[OleDbException (0x80004005): 未指定的错误]
   System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) +968349
   System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) +86
   System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) +29
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +4862012
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
   System.Data.OleDb.OleDbConnection.Open() +40
   DAL.sqlHelper.ExecuteReader(String cn, String cmdText) +200
   DAL.QTshowServer.NowLocation(Int32 loca, Int32 tcid) +361
   BLL.QTshow.NowLocation(Int32 loca, Int32 tcid) +51
   products.Page_Load(Object sender, EventArgs e) +947
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627