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Figure 6-17. Confirm that you want to disable a user account. To re-enable a user account, perform the following steps: 1. Right-click the user account that you wish to enable. 2. Click Enable Account on the context menu, as shown in Figure 6-18.

Deleting a character (backspace). Currently this steps over a format character (unlinked MaskedTextBox, which steps over and deletes the next input character). You could use the private SkipToEditableCharacter() method to change this behavior. ((int)e.KeyChar == (int)Keys.Back) if (pos > 0) { pos--; maskProvider.RemoveAt(pos); }

} // Adding a character. else if (pos < this.Text.Length) { pos = SkipToEditableCharacter(pos); // Overwrite mode is on. if (GetKeyState((int)Keys.Insert) == 1) { if (maskProvider.Replace(e.KeyChar, pos)) { pos++; } } // Insert mode is on. else { if (maskProvider.InsertAt(e.KeyChar, pos)) { pos++; } } // Find the new cursor position. pos = SkipToEditableCharacter(pos); } RefreshText(pos); e.Handled = true; } base.OnKeyPress(e); }

HOW TO OBTAIN, INSTALL, AND USE F#

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The OnKeyDown() method allows you to handle special extended keys, like Delete. protected override void OnKeyDown(KeyEventArgs e) { int pos = this.SelectionStart; // // // // // // if { Deleting a character (Delete key). Currently this does nothing if you try to delete a format character (unliked MaskedTextBox, which deletes the next input character). You could use the private SkipToEditableCharacter method to change this behavior. ((int)e.KeyCode == (int)Keys.Delete && pos < (this.Text.Length)) if (maskProvider.RemoveAt(pos)) { RefreshText(pos); } e.Handled = true; } base.OnKeyDown(e); } Figure 18-10 shows the MaskedComboBox at work.

Once the user account has been created, you can easily change any of the account properties, such as the actual name, the logon name, the password, and even the shared folder access privileges. To open the properties of a particular user account, either double-click that user account or select the user account and then click Properties. You then see the Properties dialog box for the selected user account, as shown in Figure 6-19.

Figure 18-10. Entering data in a custom masked combo box This lengthy code still doesn t provide all the functionality you probably want. For example, you may want to handle the WM_PASTE message by overriding the WndProc() method so that you can accept pasted text. You might also want to add logic to the OnKeyDown() method to handle keystrokes when text is selected (like Delete).

This chapter gave an in-depth look at different validation techniques, from the simple (validation events and the ErrorProvider) to the most sophisticated (regular expressions, custom validation components, and masked controls). For more tips about preventing invalid input and managing complexity, refer to Appendix A, which gives a basic user-interface design primer.

Note Mono is a free, open-source, multi-platform implementation of the Common Language Runtime (CLR), which is compliant with the ECMA specifications of the Common Language Infrastructure (CLI) and compatible with Microsoft .NET. It is implemented by Novell with the aid of a number of community volunteers.

Figure 6-19. User account properties The Properties dialog box has two tabs, General and Shared Folder Access. The General tab has two sections: Properties: You can change the first name, last name, and logon name for the selected account, as well as enable remote access for the user by placing a check in the box. Account Status: You can view the current status of the user account and click a button to change the password or disable the account. If you want to change the user account password, click the Change Password button to open the Change Password dialog box, shown in Figure 6-20. Enter the new password (conforming to whatever password requirements are set up), enter it again to confirm, and then click the OK button.

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