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Can you check if the line: DbProviderFactory factory = DbProviderFactories.GetFactory("Oracle.DataAccess.Client"); works in a simple console app?
I had the same problem when I had installed both x86 and x64 versions of ODAC. There are two workarounds for x86&x64 issue here[http://connect.microsoft.com/VisualStudio/feedback/details/728483/edmgen-4-0-with-oracle11g-dac-win-7-x64] .