BadImageFormatException is raised when attempting to load the Oracle client library. This problem occurs if you are running in 64-bit mode with the 32-bit Oracle client component installed.

Exception Occurrence background:

System Environment Win7 X64 flagship edition

Programming environment X64 ORACLE11G client, X86 VS2010

Throws an BadImageFormatException exception when the program connects to the database.

Exception message prompt:

BadImageFormatException is raised when attempting to load the Oracle client library. This problem occurs if you are running in 64-bit mode with the 32-bit Oracle client component installed.

Exception Location:

Introducing the System.Data.OracleClient.dll version issue

Exception resolution Method:

Original DLL version: C:\Program Files (x86) \reference Assemblies\microsoft\framework\. Netframework\v4.0\system.data.oracleclient.dll (under System default installation path)

This version of System.Data.OracleClient.dll is X86 net4.0.

Modified DLL version: can be replaced with X64 System.Data.OracleClient.dll or. NET 4.0 or. NET 2.0

BadImageFormatException is raised when attempting to load the Oracle client library. This problem occurs if you are running in 64-bit mode with the 32-bit Oracle client component installed.