Are you using a TabCtrl(CTabCtrl) or just a Propertysheet with pages?

You wont see much of a performance difference between the OLE DB ODBC provider and using the ODBC API directly. OLE DB is based on COM and it doesnt introduce any overhead. OLE DB is basically to use COM so that we can have a plug-and-play architecture for application components.

try it with the filehandle

Did you try it by subclassing cbutton.....you should derive your own class(CMyButton) from CButton and use CMyButton on your dialog box instead of CButton and then add the messagemap for WM_CHAR ...it will work... cheers

Copy your dll in the same folder as exe just so that your latest dll will be loaded or else search and delete all the other copies of dll.