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Is object code the same thing as assembly source code? According to the wikipedia article object code is usually machine code, which is not the case for C, C++ or C# right?
And assembly source code, and machine code (as close as they are) are two different things, right?
Yes, they're different.
Source code is text.
Object code is binary machine language.
Get/use a good hex editor and open some programs up and take a look.
Definately not something you'll get from notepad.
Machine code is the actual collection of bit-patterns that execute on a particular CPU. The term "object code" is sometimes used to refer to the most basic kind of output produced by compilers, but the more common expression is simply "object files". You can think of them as chunks of machine code organized in such a way that makes it possible for the linker to produce more complex file types (library files, executables, etc). Source code, whatever the language, is simply the textual representation of programming concepts. For languages like assembly, C, and C++, source code is typically converted to stuff that runs on CPU's. Other languages, like C# and Java, generally convert it to some sort of "pseudo machine code" that executes within a "virtual machine". Some interpreted languages don't even go this far and instead just execute in a virtual environment right as the source is being parsed. Ultimately, though, the implementation of any given language can take any one of these routes (or some other route, for that matter), so there really isn't one "right" answer for what sort of output to expect.
The object code is the stuff that's in the object file. That might be machine code or it could be something else (like VM code, IL, etc)