Simple c# question

I'm kind of new to programming, how does one read a single button press from the keyboard, and then check to make sure that it's a printable character?

Also, how does one take a integer input from the keyboard? More specifically, how do I force the user to retry their input until it's a number I accept?

>>12
We could discuss on how C++, C# and Java are two bad examples of Object Oriented language, and how a pure, yet simple, message-passing OO-system (like Smalltalk's), or a massive multidispatch system like CLOS are much better.
But, you know, fuck you faggot.