Sorry for the delay: busy week last week.

You should download dnSpy or ILSPy. dnSpy is nicer and it also has a debugger which allows you not only to decompile C#/.NET code, but it even allows you to edit it, rebuild it, place breakpoints and run, etc… If it’s obfuscated, get de4dot and drag the file onto de4dot first, then use dnSpy after.

Have fun… Much easier than native code