Read DLL content grammatically in C#

I am working on a small c# console application that will check my .net DLL and look for environment specific information from compiled dll.

Basically, I want to check c# Web published project and display any file contain production specific information developer forgot to update...

Issue: I am running into is when a developer switch between environment from Dev to test and test to prod. They forget to switch their environment value either in C# or web.config file.

Is there a way I can open individual DLL and extract the DLL content as a string using C# code and a free decompiler?