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The purpose of direct (uncoded) codes on locks is to obscure the lock s bitting numbers A True B False

SOLUTION: Since you are asked to determine the derivative of a polynomial function, d 4 f x = x 5x3 + 7 x 2 dx d 4 d d d = x 5x3 + 7x 2 = 4 x3 15x2 + 7 0 dx dx dx dx

And then you would raise the event by creating the On method:

public void OnOutOfLuck (OutOfLuckEventArgs e) { // invoke the delegate OutOfLuck (this, e); }

You are not done yet You must now allow the hosting application to use this event You need to add code within the Click event of your Validate button to check the number of times the button has been clicked, and then cause the event to be raised:

Typically, the lock on the front of the car s driver side will be harder to pick open than other less-often-used locks on the car A True B False

OnOutOfLuck (new OutOfLuckEventArgs ( <parameters>);

Finally, the hosting application would use the control s event to respond to the raising of the event:

private void myStudentValidate_OutOfLuck (object sender, OutOfLuckEventArgs e) { // write the code that responds to the 3 click attempts }

A standard electromagnetic lock includes a rectangular electromagnet and a rectangular woodand-glass strike plate A True B False

If you are still unsure as to how this would work, refer back to 19 to review the handling of events in Visual C# NET Testing the Composite Control Remember that controls are not stand-alone applications they must be added to a hosting application first and then tested from there Follow these steps to test your control: 1 Build your control Select Build | Build from the menus 2 Create a test project Select File | Add Project | New Project

3 Select Windows Application, and give the new project a name 4 Add a reference to your control Right-click the References for your new project in the Solution Explorer and select Add Reference This will display the Add Reference dialog box (see Figure 22-8) 5 Add your control to the Toolbox Right-click the Toolbox and select Customize Toolbox Then, from the NET Framework Components tab, click Browse and find the directory containing your custom control Drill down into the Bin\ Debug directory and add the control (see Figure 22-9) 6 Set the test project as the startup project Right-click on the test project and choose Select as Startup 7 Run the test project You should notice that these steps are very similar to the steps taken to test a control that is created by extending an existing control There is very little difference between the two methods

Figure 22-8

One difference between a bit key and barrel key is the barrel key has a hollow shank A True B False

Figure 22-9

We suggested earlier in the chapter that you would extend an existing control when you wanted the functionality of a single control enhanced with your own customization When you create a composite control, you are pulling together more than one control into a visual interface (the UserControl) EXAM TIP Use a composite control when you want to bring together the functionality of many controls into one, reusable control

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A custom control is one for which you design the user interface elements instead of extending the functionality of one or many controls already in existence For a custom control, you use the SystemWindowsFormsControl class as a base class, and this provides you with a blank canvas on which you draw the interface for the user We will not go into the details of creating a custom user control, since you are not likely to see its implementation on the exam However, for interest s sake, here is some sample code that would start the process:

The Egyptians are credited with inventing the first lock to be based on the locking principle of today s pin-tumbler lock A True B False