Patterns & practices: Enterprise Library Contribution Data ODP.NET Managed Provider for IBM iSeries DB2 Databases
Make sure your environment is running the latest IBM DB2 for i .NET Provider, the most recent IBM i Access for Windows service pack is available here : https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/IBM%20i%20Access%20for%20Windows%20-%20Service%20Packs