Basic drawing program

Question

Hi guys, I'm a first time poster, but a long time fan. I'm working on a final project for my C# class, and I want to add a bit of flash to it. I'd like to make it so that the user can draw when they left-click. I'll elaborate from there, but if anyone could give me a little overview (or direct me to a better source) I'd really appreciate it. P.S. any other nifty little "drawing program" tips would be immensly appreciated. Thanks! Sean Wcisel