I'm not sure why your first question was closed. Your answer is even an example of a good answer - it cites a language that is an example of one that has undergone usability testing and what they found by doing the studies. Other good answers might have identified other languages that had undergone usability testing, if any existed, and would point to what was learned (or what couldn't be learned) in that process, or resources about conducting usability testing on a new language.
At this point, you probably should have came to Meta to find out why your question was closed instead of posting a new question. Rather than taking shots in the dark at improving your question (and risking a second closure and down votes - two things that go into the triggering of the automatic question ban), finding out exactly what was wrong and trying to fix the question is preferred.
As for your second question, it has a few of its own problems. The question itself answers part of the questions asked. It's evident from the quotation in the body of the question that C# was indeed usability tested, which is the title question. The parts of the language that were tested and the results of those tests (or, at least some of them) were also identified in that quotation. It's not really clear what else you're looking for. Also, although self-answering is allowed, posting multiple answers to one question isn't recommended - answers should address the entire question and be relatively complete (for example, not listing one feature or test per answer, like it appeared you started to do).
If you aren't sure if a question is good, you can also ask about how to best ask it here on Meta or in our chat room.