Enter the following within curly braces below this line:
Circle circ = new Circle();
So we're creating a new Circle object. Now, remember, because this is going into TextBox1_TextChanged, and every time you press Enter, this will run again. Keep this in mind. That's OK for us--it doesn't really matter very much. We're just illustrating some basic concepts here.
Now add comment 11 at the end of this line, as follows:
//11. Makes a new circle object
Then, what we'll do is as follows. We'll set something. So, to set the radius, type the name of the object, that is, . (dot), and then notice that a little wrench shows together with the word Radius. When you select this from the list, it says get and set in a tooltip (refer ...