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As of .NET 2.0, we now have a masked text box that allows us to specify a valid sequence of characters that will be accepted by the input area (Social Security number, phone number with area code, zip code, or whatnot). The mask to test against (termed a mask expression) is established using specific tokens embedded into a string literal. Once you have created a mask expression, this value is assigned to the Mask property. Table 21-3 documents some (but not all) valid masking tokens. Table 21-3. Mask Tokens of MaskedTextBox

Represents a mandatory digit with the value 0 9 Represents an optional digit or a space Required letter (in uppercase or lowercase), A Z Optional letter (in uppercase or lowercase), A Z Represents a thousands separator placeholder Represents a time placeholder Represents a date placeholder Represents a currency symbol

Resizes or moves a control on a form. Holds text that is not editable except through code. Holds text that users can enter or modify.

The characters understood by the MaskedTextBox do not directly map to the syntax of regular expressions. Although .NET provides namespaces to work with proper regular expressions (System.Text.RegularExpressions and System.Web.RegularExpressions), the MaskedTextBox uses syntax based on the legacy MaskedEdit VB6 COM control.

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In addition to the Mask property, the MaskedTextBox has additional members that determine how this control should respond if the user enters incorrect data. For example, BeepOnError will cause the control to (obviously) issue a beep when the mask is not honored, and it prevents the illegal character from being processed. To illustrate the use of the MaskedTextBox, add an additional Label and MaskedTextBox to your current Form. Although you are free to build a mask pattern directly in code, the Properties window provides an ellipsis button for the Mask property that will launch a dialog box with a number of predefined masks (see Figure 21-6).

A shorthand property used to specify all four individual margin properties in one step. Value: Multiple instances of <length> | <percentage> | auto Initial value: 0 Inherited: No Applies to: All elements Supported by: Firefox, Safari, Opera, Internet Explorer

In a similar vein, contravariance allows you to create a single delegate that can point to numerous methods that receive objects related by classical inheritance. Consult the .NET Framework 2.0 SDK Documentation for further details.

Delegates are fairly interesting constructs in that they enable two objects in memory to engage in a two-way conversation. As you may agree, however, working with delegates in the raw does entail a good amount of boilerplate code (defining the delegate, declaring necessary member variables, and creating custom registration/unregistration methods). Because the ability for one object to call back to another object is such a helpful construct, C# provides the event keyword to lessen the burden of using delegates in the raw. When the compiler processes the event keyword, you are automatically provided with registration and unregistration methods as well as any necessary member variable for your delegate types. In this light, the event keyword is little more than syntactic sugar, which can be used to save you some typing time.

A combination of a list box and a text box. Users can choose an item from a list or enter a value in the text box. Displays a list of items from which users can choose. Indicates a true or false value. Presents multiple choices, of which only one can be selected. A button that toggles off and on. A grouping for controls such as option buttons or check boxes. Users can only select one of a group of controls placed inside a Frame control. A button the user can click to perform an action. Multiple pages in the same form area. Multiple screens of information. Provides quick navigation through a long list of items. It is also useful for indicating the current position on a scale, or as an input device or indicator of speed or quantity. Increments or decrements a numeric value. Presents an image from a bitmap, icon, or metafile. Simulates the behavior of the reference edit boxes such as the Range selector in the Print Area section of the Page Setup dialog box.

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