This is the most common pitfall. If your application is 32-bit (x86) , you must use the 32-bit version of the DLL. If it is 64-bit (x64) , you must use the 64-bit version. They are not interchangeable. Common Troubleshooting
Files from third-party archives can be bundled with malware or altered maliciously. Where to Safely Download Version 4.112.3.0 oracle.dataaccess.dll version 4.112.3.0 download
# Navigate to your ODP.NET bin folder cd C:\app\oracle\product\11.2.0\client_1\odp.net\bin\4 # Register the DLL OraProvCfg.exe /action:gac /providerpath:Oracle.DataAccess.dll Use code with caution. ODAC 11.2.0.3.0 Install Instructions - Oracle This is the most common pitfall