Beginner C# PictureBox question

Question

Ahoy,

I'm fairly new to C# and I have a question I'm hoping someone here can help me with.

I've mastered most of the basics of OOP, classes, inheritance, functions, etc.  I'm trying to program a basic 'game' in a Windows Form where the player moves around the screen and dodges moving objects.  I've gotten just about everything figured out, except that I can't get the image in a PictureBox to change on a particular event (like a KeyDown).  Namely, I want the player graphic to change between facing left and right depending on which way the player is moving.

If anybody is able to give me some advice, or a good resource site to check out, I'd be most grateful.  I would check through the Help files, but the school didn't bother installing them with the IDE, so I'm kind of stuck there.

Thank you for your time.