We have a decade old web forms application which uses Enterprise Library 5.0.414.0 with Oracle.DataAccess.dll (4.112.) to connect to our Oracle DB, and this worked flawlessly until recently. With the removal of VC++ 2012 REDISTRIBUTABLE in our servers, we are now compelled to use the Enterprise Library 6.0 with oracle.manageddataaccess.dll (v19.1 upwards) as the earlier version had a strong reference to Oracle.DataAccess.dll (4.112.).