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The MaskedTextBox control doesn t actually include the functionality needed to validate masks. Instead, the MaskedTextBox control relies on a more generic service provided by another class the MaskedTextProvider class in the System.ComponentModel namespace. You can use the MaskedTextProvider to implement your own masked control, although the process probably won t be easy because it needs you to have fine-grained control over the display and keyboard handling of the control. To create a custom masked control, you need to follow these guidelines: Create a control that maintains an instance of MaskedTextProvider internally. The MaskedTextProvider is stateful it maintains the text that the user has entered into the mask so far. Whenever the custom control receives a key press, determine the attempted action and pass it on to the MaskedTextProvider using methods like Add(), Insert(), Remove(), and Replace(). The MaskedTextProvider will automatically ignore invalid characters. After you ve sent a change to the MaskedTextProvider, call MaskedTextProvider. ToDisplayString() to get the latest text. You can then refresh your custom control. Ideally, you ll update just those characters that have changed, although that often isn t when you re deriving from other controls, in which case you may need to replace all the text in one operation, which might cause flicker.

3. You are asked to confirm you want to disable the user account, as shown in Figure 6-17. Click Yes to disable it.

This section is for people using an older version of Visual Studio. (As noted, Visual Studio 2010 users will already have F# installed.) Installing F# on Windows with Visual Studio 2008 is straightforward. You need to be running an account with system administrator privileges, then download the MSI version as described in the previous section, and execute it. Please note that at the time of this writing the free Express Editions of Visual Studio do not support plug-ins, so you cannot use F# integration with them. However, you can install F# s plug-in on top of the free Visual Studio 2008 Shell. See the MSDN Visual Studio Extensibility center for more details on Visual Studio 2008 Shell at http://msdn.microsoft.com/vsx2008/.

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The difficulty in using the MaskedTextProvider is keeping track of all the low-level details, like the user s current position in the input string. The following example creates a custom ComboBox control that uses this principle to support masking in a combo box. First of all, you need to create a class that derives from ComboBox, create the private MaskedTextProvider member, and expose the Mask and MaskCompleted properties. public class MaskedComboBox : ComboBox { private MaskedTextProvider maskProvider = null; public string Mask { get { if (maskProvider == null) { return ""; } else { return maskProvider.Mask; } } set { if (value.Length == 0) { maskProvider = null; this.Text = ""; } else { // This is necessary because the Mask property is read-only. maskProvider = new MaskedTextProvider(value); this.Text = maskProvider.ToDisplayString(); } } } public bool MaskCompleted { get { return maskProvider.MaskCompleted; } } // (Other code omitted.) }

The next step is to create two useful private functions that you ll need to rely on. First, the SkipToEditableCharacter() method returns the edit position where the cursor should be positioned. You need to call this at various times as the user moves through the mask to make sure you skip over mask characters. MaskedTextProvider.FindEditPostionFrom() performs the hard work, finding the next valid insertion point to the right of the current cursor position. private int SkipToEditableCharacter(int startPos) { int newPos = maskProvider.FindEditPositionFrom(startPos, true); if (newPos == -1) { // Already at the end of the string. return startPos; } else { return newPos; } } Another important private method is RefreshText(), which gets the most recent text from the MaskedTextProvider, displays it in the current control, and resets the cursor to the correct position. private void RefreshText(int pos) { this.Text = maskProvider.ToDisplayString(); // Position cursor. this.SelectionStart = pos; } The final detail is to override OnKeyDown() and OnKeyPress(). You can use OnKeyPress() to react to ordinary characters and the Backspace key. However, when inserting a character you need to take special care to find out whether the Insert key is currently on. Notice that the code sets the e.Handled property to true so the key won t be processed any further by the base ComboBox class. [DllImport("user32.dll")] extern static int GetKeyState(int key); protected override void OnKeyPress(KeyPressEventArgs e) { if (maskProvider != null) { int pos = this.SelectionStart;

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If you are unfamiliar with Linux and would like to try Mono, the simplest way is to download the SUSE Linux virtual machine (VM) image available on the Mono web site at http://www.go-mono.com/monodownloads.

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