When release dlls don't work but debug dlls do

Question

After deploying our huge distributed system to one of our clients we experience an unexpected error. During the investigation we replace the assembly causing the error with

Answer 1

It might be some sort of race condition you have, if you're not working in single-threaded code. For example, if some part of your program needs to perform some actions before other parts can access it, it might fail in release mode simply because the code is accessed too early. We once had a similar problem with some code for mobile phones which ran fine in the emulator but on the phone which was slower, the sitution was not the same at all.