Oracle Managed Data Access DLL upgrading to latest version causes compile errors

Question

When I upgraded Oracle.ManagedDatabaseAccess.dll from v. 4.122.18.3 to v. 4.122.21.1 there are several compile errors, specifically:

error CS0246: The type or namespace name 'Oracle' could not be found (are you missing a using directive or an assembly reference?)

The reference has been added. I initially used a version-specific folder, and thinking this could cause some sort of problem, I moved it to the exact same folder where the older DLL had been successfully referenced, and there was still the problem.

This is somewhat like Similar Oracle problem , except that the linked post appears to be about Oracle.DataAccess.DLL whereas this is the managed version, Oracle.ManagedDataAcess.dll

I also have tried cleaning and "rebuild all" as well as unloading the problematic project in the solution and reloading it also, and neither helps.

As far as I can discern, both DLL's are 32-bit.

I am using Visual Studio 2019, a C#, asp.net context, and since the other Oracle.ManagedDataAccess.dll worked without special usage of a "register DLL" procedure, I'm not certain if that is needed or will help.

Is there any help for this situation?

Answer 1

Turns out that I needed to use .net Version 4.6.2. This locally built on my machine and everything worked. We are not ready for this so I reverted to the previous DLL, but thanks. Also, when changing .net versions, one sometimes has to load/unload projects, restart Visual studio, and make sure the saves of the project file actually "take".

Perhaps this Question and Answer will help someone else, someday.