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Another way to check whether a numeric value is acceptable for an Enum object is the GetName method, which returns the name of the enumerated value or returns Nothing if the value is invalid:

GetName doesn t require that the value being converted be the same type as the Enum. If [Enum].GetName(GetType(DataEntry), 3) <> Then de = CType(3, DataEntry) End If

You can quickly list all the values of an enumerated type with the GetNames and GetValues methods. The former returns a String array holding the individual names (sorted by the corresponding values); the latter returns an Object array that holds the numeric values:

The next two pages appear. Note that in Print Preview, pages are not speci cally displayed in spreads.

Dim names() As String = [Enum].GetNames(GetType(DataEntry))

pressedKeys = new Keys[4];

Dim values As Array = [Enum].GetValues(GetType(DataEntry))

For i As Integer = 0 To names.Length - 1

Here s the output of the preceding code snippet:

The .NET Framework supports a special Flags attribute that you can use to specify that an Enum object represents a bit-coded value. For example, let s create a new class

The only way that you can get hold of this array is by using pressedKeys to locate it. If the pressedKeys variable is destroyed or overwritten, the object might as well not exist, as you have no way of getting in touch with it. This is the same as if you met someone wonderful at a party and failed to get their telephone number. If you can t get to an object, it might as well not be there.

glass, click the mouse button. Publisher displays the part of page 3 that you clicked at a Zoom percentage of 100%.

Part III:

The Opacity property lets you apply a level of transparency to the entire form, including its title bar and borders. It s a Double value in the range 0 to 1, so you can change the opacity level with fine granularity. You can use it for special effects such as fade-ins and fade-outs. You can mix it with the TransparencyKey property, as the sample application provided with the companion code for this book demonstrates. (See Figure 15-26.) Oddly, both the TransparencyKey and Opacity properties make the form completely transparent to most screen capture programs, and in fact I was in trouble when I had to shoot Figures 15-25 and 15-26. I was so desperate that I almost gave up, but I tried the nearly forgotten PrintScreen key, which worked perfectly and copied the screen image to the Clipboard.

15:

Figure 15-26

Within C#, there s a special mechanism for getting rid of objects that might as well not be there. The garbage collector process has the job of looking for objects that do not have anything referring to them and removing them from memory. Memory allocation is an important part of programming, and you need to be careful not to make too much work for the garbage collector. An inexperienced programmer could write the following C# code:

Most Windows XP applications use the look and feel introduced with this version of the operating system. Controls using this visual style have rounded corners and change their appearance when the mouse hovers on them. More specifically, the Windows XP visual style changed the way the non-client area of the control is drawn. Enforcing Windows XP visual styles is as simple as invoking the Application.EnableVisualStyles method, which was added in .NET Framework 1.1. You must call this method before the first form is displayed, so an application that leverages this feature should display its startup form from inside the Sub Main procedure:

1

<System.STAThread()> _ Public Sub Main() Application.EnableVisualStyles() Application.Run(New StartupForm) End Sub

The majority of Windows Forms controls adopt the most recent UI style automatically, for example the TextBox, ListBox, ComboBox, DataGrid, TreeView, ListView, ProgressBar, TrackBar, DateTimePicker, MonthCalendar, TabControl, and the two scroll bar controls. The four controls that inherit from ButtonBase class namely Button, CheckBox, RadioButton, and GroupBox take the new style only if you set their FlatStyle property to System. Finally, a few controls aren t affected at all by the EnableVisualStyles method, including the Label, LinkLabel, NumericUpDown, DomainUpDown, and CheckListBox. Figure 15-27 shows a form that uses the new UI style.

Part IV: