We all bounce off the walls from time to time, here is some code without explanation on how to do so. You will need a really simple png image to make this happen, or even a real complex one.
You will need a small png to do this app, I have attached the working code at the end of the article.
For your game class, replace all of the code with the first block and then below it is the ball class (make sure to scroll down to get the code for the ball class below the first code block):
Now create a class named ball.cs and cut and paste the following to the class code: