Microsoft deprecates OracleClient
ADO.NET Team announced the deprecation of System.Data.OracleClient. It will still be shipped with .NET Framework 4.0 but will be marked as “Deprecated”.
Since it is being deprecated, all clients using System.Data.OracleClient are expected to migrate their applications to use ODP.NET (Oracle Data Provider for .NET).
For further reading, please visit http://blogs.msdn.com/adonet/archive/2009/06/15/system-data-oracleclient-update.aspx.