I must say that you won't probably be able to find any book or tutorial on this topic by two very simple reasons: 1) to best of my knowledge, at this moment, non of the platforms which can use C# (there are quite a few of them, not just Windows) are real-time systems; even if I missed something, then… 2) Web applications or Web sites cannot be uses as real-time systems or participate in any real-time processing due to their nature.
At the same time, you possibly can find what you need, only don't call it "real-time". Try to formulate what you really need and clarify your question, use "Improve question".
Do do it, you need to know what is real time, what kind of real-time systems or processing are there and what a real-time system is not. See:
http://en.wikipedia.org/wiki/Real-time_computing[
^],
http://en.wikipedia.org/wiki/Real-time_operating_system[
^].
At the same time, there is some low-tech jargon where the term "real-time" is understood in some different sense. The articles referenced by Nikil are of that kind. What is described there have nothing to do with real time, not in any of the strict meanings of this term. Who knows you; may be this is what you really need?
—SA
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