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As a final UI task, select the OK button on the Forms designer and find the DialogResult property. Assign DialogResult.OK to your OK button and DialogResult.Cancel to your Cancel button. Formally, you can assign the DialogResult property to any value from the DialogResult enumeration: public enum System.Windows.Forms.DialogResult { Abort, Cancel, Ignore, No, None, OK, Retry, Yes } So, what exactly does it mean to assign a Button s DialogResult value This property can be assigned to any Button type (as well as the Form itself ) and allows the parent Form to determine which button the end user selected. To illustrate, update the Tools Configure menu handler on the MainForm type as so: private void configureToolStripMenuItem_Click(object sender, EventArgs e) { // Create an instance of UserMessageDialog. UserMessageDialog dlg = new UserMessageDialog(); // Place the current message in the TextBox. dlg.Message = userMessage;

// If user clicked OK button, render his message. if (DialogResult.OK == dlg.ShowDialog()) { userMessage = dlg.Message; Invalidate(); } // Have dialog clean up internal widgets now, rather // than when the GC destroys the object. dlg.Dispose(); } Here, you are showing the UserMessageDialog via a call to ShowDialog(). This method will launch the Form as a modal dialog box which, as you may know, means the user is unable to activate the main form until she dismisses the dialog box. Once the user does dismiss the dialog box (by clicking the OK or Cancel button), the Form is no longer visible, but it is still in memory. Therefore, you are able to ask the UserMessageDialog instance (dlg) for its new Message value in the event the user has clicked the OK button. If so, you render the new message. If not, you do nothing.

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Figure 4-19. Employee access information Our wizard UserForm will walk the user through entering this information for new employees. In turn, each piece of information will be forwarded to the appropriate department for processing.

Used to specify the position of elements whose position property is set to fixed, absolute, or relative. Value: <length> | <percentage> | auto Initial value: auto Inherited: No Applies to: Elements with position other than static Supported by: Firefox, Safari, Opera, Internet Explorer

If you wish to show a modeless dialog box (which allows the user to navigate between the parent and dialog Forms), call Show() rather than ShowDialog().

One very appealing aspect of building dialog boxes under Windows Forms is form inheritance. As you are no doubt aware, inheritance is the pillar of OOP that allows one class to extend the functionality of another class. Typically, when you speak of inheritance, you envision one non-GUI type (e.g., SportsCar) deriving from another non-GUI type (e.g., Car). However, in the world of Windows Forms, it is possible for one Form to derive from another Form and in the process inherit the base class s widgets and implementation. Form-level inheritance is a very powerful technique, as it allows you to build a base Form that provides core-level functionality for a family of related dialog boxes. If you were to bundle these base-level Forms into a .NET assembly, other members of your team could extend these types using the .NET language of their choice. For the sake of illustration, assume you wish to subclass the UserMessageDialog to build a new dialog box that also allows the user to specify if the message should be rendered in italics. To do so, active the Project Add Windows Form menu item, but this time add a new Inherited Form named ItalicUserMessageDialog.cs (see Figure 21-36).

Once you select Add, you will be shown the inheritance picker utility, which allows you to choose from a Form in your current project or select a Form in an external assembly via the Browse button. For this example, select your existing UserMessageDialog type. You will find that your new Form type extends your current dialog type rather than directly from Form. At this point, you are free to extend this derived Form any way you choose. For test purposes, simply add a new CheckBox control (named checkBoxItalic) that is exposed through a property named Italic: public partial class ItalicUserMessageDialog : SimpleModalDialog.UserMessageDialog { public ItalicUserMessageDialog() { InitializeComponent(); } public bool Italic { set { checkBoxItalic.Checked = value; } get { return checkBoxItalic.Checked; } } } Now that you have subclassed the basic UserMessageDialog type, update your MainForm to leverage the new Italic property. Simply add a new Boolean member variable that will be used to build an italic Font object, and update your Tools Configure Click menu handler to make use of ItalicUserMessageDialog. Here is the complete update: public partial class MainWindow : Form { private string userMessage = "Default Message"; private bool textIsItalic = false; ... private void configureToolStripMenuItem_Click(object sender, EventArgs e)

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