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Rather than call the Focus() method programmatically, you can set a control so that it is always the first to get focused (unless you override it by calling the Focus() method) You do this by setting the DefaultFocus property, like so: <form id="Form1" defaultfocus="TextBox2" runat="server"> As you can see, the focusing code relies on a JavaScript method named WebForm_AutoFocus(), which ASPNET generates automatically Technically, the JavaScript method is provided through an ASP NET extension named WebResourceaxd The resource is named Focusjs If you dig through the rendered HTML of your page, you ll find an element that links to this JavaScript file that looks something like this: <script src="WebResourceaxd a=s&r=WebFormsjs"></script> You can type this request directly into your browser to download and examine the JavaScript document.

So far, each one of your custom windows/dialog boxes in this chapter has derived directly from System.Windows.Forms.Form. However, one intriguing aspect of Windows Forms development is the fact that Form types can function as the base class to derived Forms. For example, assume you create a .NET code library that contains each of your company s core dialog boxes. Later, you decide that your company s About box is a bit on the bland side, and you wish to add a 3D image of your company logo. Rather than having to re-create the entire About box, you can extend the basic About box, thereby inheriting the core look-and-feel: // ThreeDAboutBox "is-a" AboutBox public partial class ThreeDAboutBox : AboutBox { // Add code to render company logo... } To see form inheritance in action, insert a new form into your project using the Project Add Windows Form menu option. This time, however, pick the Inherited Form icon, and name your new form ImageOrderAutoDialog.cs (see Figure A-18).

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It s quite lengthy, because it carefully deals with cases such as focusing on a nonfocusable control that contains a focusable child However, the following code shows the heart of the focusing logic: function WebForm_AutoFocus(focusId) { // Find the element based on the ID (code differs based on browser) var targetControl; if (__nonMSDOMBrowser) { targetControl = documentgetElementById(focusId); } else { targetControl = documentall[focusId]; } // Check if the control can accept focus or contains a child that can var focused = targetControl; if (targetControl != null && (!WebForm_CanFocus(targetControl)) ) { focused = WebForm_FindFirstFocusableChild(targetControl); }.

Figure A-18. Adding a derived form to your project This option brings up the Inheritance Picker dialog box, which shows you each of the forms in your current project. Notice that the Browse button allows you to pick a form in an external .NET assembly. Here, simply pick your OrderAutoDialog class.

You should now see a TextInput box asking you to insert the WSDL URL (see Figure 8-21).

The CLS defines the standard properties that all objects must contain in order to communicate with one another in a homogenous environment. To allow this communication, the CLR expects all objects to adhere to a specific set of rules. The CLS is this set of rules. It defines many laws that all languages must follow, such as types, primitive types, method overloading, and so on. Any compiler that generates IL code to be executed in the CLR must adhere to all rules governed within the CLS. The CLS gives developers, vendors, and software manufacturers the opportunity to work within a common set of specifications for languages, compilers, and data types. As time goes on, you ll see more CLS-compliant languages and compilers emerge, although several are available so far. Given these criteria, the creation of a language compiler that generates true CLR-compliant code can be complex. Nevertheless, compilers can exist for virtually any language, and chances are that there may eventually be one for just about every language you d ever want to use. Imagine mainframe programmers who loved COBOL in its heyday can now use their knowledge base to create web applications!

Note You must compile your project at least one time to see the forms of your project in the Inheritance Picker dialog box because this tool reads from the assembly metadata to show you your options.

Once you click the OK button, the visual designer tools show each of the base controls on your parent controls; each control has a small arrow icon mounted on the upper-left of the control (symbolizing inheritance). To complete your derived dialog box, locate the PictureBox control from the Common Controls section of the Toolbox and add one to your derived form. Next, use the Image property to select an image file of your choosing. Figure A-19 shows one possible UI, using a (crude) hand drawing of a junker automobile (a lemon!).

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