public int firstVar = 42;
public class ZoomInAssignment {
public MainClass mainClass;
public void setFirstVar(){
public class PatioToggle {
public MainClass mainClass;
Console.WriteLine(" mainClass.firstVar should be 10: " + mainClass.firstVar);
public static void Main()
MainClass mc = new MainClass();
ZoomInAssignment za = new ZoomInAssignment();
PatioToggle pt = new PatioToggle();