BadImageFormatException. This will occur when running in 64 bit mode with the 32 bit Oracle client components installed

Question

I am getting this error while on of my .Net application are trying to make a connection to oracle database.

The error says that This problem will

Answer 1

I had this error in my DNN application installed on Windows 2012 R2. It's using some 32 bit dll and only Oracle.DataAccess.dll x32 was working. My solution is:

1. Uninstall old Oracle Client \ ODAC.
2. Install Oracle 11 Client x32.
3. Install Oracle ODAC 12 x64.
4. Check IIS Application Pool (Classic version) has option "Enable 32-Bit Applications" = true.