Error "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

Question

I'm trying to open OracleConnection microsoft provider (System.Data.OracleClient). And I'm getting this error only in RELEASE not in DEBUG

Answer 1

I solved problem, problem was that I was referencing some DLL with unmanaged code and those DLL wasn't even used in my code, just when I removed them from reference everything worked fine.

Answer 2

I had that error from computers using my software, which read and wrote basically all free bytes of hard disks (a recovery and deletion software). Back then (2009) I could track it down to a low-level problem of the harddisks of our customers. It never happened on a healthy disk. From that experience, and the missing of any question on your part, I would say it's a hard disk failure and you should test out if the error is reproductible on a fresh database on another physical computer.

If so, quickly change disks on that database server or whatever you're reading to / writing from and restore that machine from a backup.