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Oracle Data Provider for Entity Framework 4
Oracle just launched the Data Provider for Entity Framework that supports LINQ and EF 4.
ODAC 11.2 Release 4 Production Released with Entity Framework and LINQ Support
ODAC 11.2 Release 4 (11.2.0.3) has arrived for Entity Framework and LINQ developers! It includes 32-bit and x64 versions with the option of using an automated installer or xcopy deployment.
The release incorporates Oracle Database client 11.2.0.3, which can access Oracle Database 9.2 and higher. Oracle supports Entity Framework and LINQ with Microsoft Visual Studio 2010 and .NET Framework 4, including Entity Framework 4.1 and 4.2.
Download ODAC 11.2 Release 4
32-bit ODAC with Oracle Developer Tools for Visual Studio
x64 ODAC installer and xcopy
Here is a good article on how to use Oracle Data Provider in .NET.
Use Entity Framework with ODP.NET