Don't suppose you'll get a lot of responses since that's such an
open-ended
Yeah. Whew! C# can be used for almost anything. It would be easier to
list what it is not good for, such as device drivers, firmware, and anything
else that is overly hardware specific. Not to say that C# isn't fine for
targeting the operating system internals via interop, it's just not any
better at that than, say, C++. The difference is that C# is much better
suited to writing GUI applications than C++ is, so if you have a GUI
application that needs to maybe access a serial port, then C# is much better
suited for that than C++ is.
For instance, see
http://www.componentscience.net/elements/transport
C# is a great language for things like console applications, windows forms
applications, web services, interactive websites, mobile device (Pocket PC)
applications, windows services, database applications, component libraries,
etc...
C# is a very nice, strongly-typed, object-oriented programming language
which is suitable for modeling all sorts of real-world problems. It is
great for developing quick-and-dirty solutions, and prototypes as well as
full-blown, cross-platform, scalable, client-server applications. The
resulting applications are blazing fast and portable (at least as much as
the .NET framework is).
I hope that helps.
fwiw, I could have written a client application with C# that checks this
newsgroup and replies with a canned response to this question. Not that that
is particularly useful, but you asked a pretty open-ended question. ;o)