As you step in and out of methods, the Call Stack window keeps track of the order and hierarchy of method calls. Figure 9-15 shows a close-up picture of the Call Stack window. You can see that the Box constructor was called by the Run( ) method, while the Run( ) method was in turn called by Main( ).
In this case, if you double-click on the second line in the Call Stack window, the debugger shows you the line in Run( ) that called the Box constructor, as shown in Figure 9-16. Notice that the debugger puts a green curved arrow on the line in the call stack you've double-clicked on, and a matching arrow in the editor to the line that corresponds to that call. This way, if you're debugging a method and you think the data causing the problem came from outside the method, you can quickly find where the method call came from and check the values at that point.
