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This method would pass the one test that you ve created but would not be a very good way to work out percentages. It does highlight a very important point, though: A test can prove only that a particular fault is not present. It can t prove that there are no faults in the code at all. The test that you wrote checks that your method could work out that 10 percent of 800 is 80. Even the original method that always returned 0 would work whenever you tried to work out 0 percent of something or any percentage of 0. If programmers claim that their code is fully tested, usually what they really mean is that they can t think of a reason it shouldn t work, and this is not quite the same thing. Testing computer programs is really difficult. If you want to test a design for a bridge over a river, you simply make a test bridge and put increasingly heavy things on it until it breaks. Then you know the heaviest thing that can go across that kind of bridge. Where computers are concerned, it doesn t work like this. A computer program might work with one value and then fail with another, slightly different one. The good news (for most of you at least) is that your programs won t ever do anything that could be called mission critical. However, if you end up writing programs for a living, you should take testing very seriously. It s what separates the Great Programmers from the merely good programmers. I ve come up with some C# code that gives your method a reasonable workout. It is not a particularly comprehensive test, but it will do for now:

The UserPropExtender control is fully functional and uses many of the techniques you should know about when writing extender providers. But because of its simplicity, it doesn t need to trap events coming from other controls on the form, which is often a requirement for extender providers. For example, the ToolTip control intercepts mouse events for all controls that have a nonempty ToolTip property, and the HelpProvider con trol intercepts the HelpRequested event to display the associated help page or string. Intercepting events from controls isn t difficult; however, when the control is added to the Hashtable (typically in the Setxxxx method), you use the AddHandler com mand to have one of its events trapped by a local procedure, and you use RemoveHandler to remove the event added dynamically when the control is removed from the Hashtable. Remarks in the preceding listing clearly show where these statements should be inserted.

Wizard check box, and then click Create. Publisher creates the home page of a Web site based on the selected template, and the Easy Web Site Builder dialog box (shown earlier in this chapter) opens. Tip In a Web Site publication, the ruler helpfully displays measurements in pixels.

Part IV:

If you re familiar with custom control authoring under Visual Basic 6, you might have noticed that I haven t mentioned property pages, either when describing built-in con trols or in this section devoted to custom control creation Property pages aren t supported in the NET architecture and have been replaced by custom property editors The most common form of property editor displays a Windows Forms control in a drop-down area inside the Properties window You can display any control in the drop-down area, such as a TrackBar, a ListBox, or even a complex control such as a TreeView or a DataGrid, but the limitation is that you can display only one control.