Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies. An attempt was made to load a program with an incorrect format

Question

I have installed a Web app on IIS 7.0 Windows Server 2008 R2 64bit. I am referring an oracle.DataAccess.dll; When I try to access the application I get the following message: \"

Answer 1

Installing 64-bit ODAC 11.2 Release 3 (11.2.0.2.1) Xcopy for Windows x64 from:

http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html

Fixed it for me. Make sure to update your system path as per step #4 in the readme file.