BadImageFormatException Error

Question

Currently I am trying to move my application from old server to new one. For the same purpose I am trying to run my application in test server. Application executes everyday and runs fine in production server. But when I test to run the application in test server I got this error System.InvalidOperationException: Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed. ---> System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B) at System.Data.Common. What do i do now to solve the issue? Thank you

Bikesh Srivastava · Answer

This can have several causes the most likely is that you are trying to load a 32bit managed dll on a 64 bit machine or vice versa. It can also mean that a dll you are dynamically loading is not a native dll or that the dll file is corrupted. It may mean that you have a dll which is using a higher version of the .Net framework than some other dll that is using it if you rebuilt a particular component with a different version for example. This question covers similar ground as does this one which also suggests a way to force your 64bit app to run in 32bit mode so it can load the 32bit dependency.

Nepethya Rana · Answer

Thank you. I resolved my issue by installing Oracle.ManagedDataAccess.Client in the project and updating the code accordingly.