This question sounds ambiguous a bit since Visual Basic is a different language from C#. You can write any program in C#, if you have already had it in Visual Basic, and well, vice versa. C# looks more professional any way. Now, I turn all my attention to C#.

In writing the "core" of an operating system, you would probably not be able to concentrate on any high level language alone be C, C++ or C#. You would definitely need assembly in certain parts. Apart from that, you may be able to write almost anything in one of these modern languages C, C++, and C#. C is now getting obsolete. For some certain applications, such as mathematics, perhaps a dedicated programming environment like MATLAB would be a faster development tool. But that would not mean that you cannot write those applications in C++ or C#. MATLAB itself has been written using a language like C++ or C#. So the practice in total is "to write a development tool using C# so that it gives me the ability to produce other applications with some programming capabilities". How big would you evaluate this? Good luck.

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