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Almost every control in .NET supports data binding in one form or another. However, different controls support data binding in different ways. For example, when binding to a text box, button, or image control, you will usually bind to the TextBox.Text, Button.Text, or PictureBox.Image property (although there are other possibilities, as you ll discover shortly). Each of these properties can bind to a single piece of information at a time through a process called simple data binding. On the other hand, a control like ListBox or CheckedListBox can hold an entire list of data or the contents of a single field from a database. There are also rich controls like DataGridView that can display all the information from a DataSet on their own. All of these controls support complex data binding, which means they can show the values from more than one row in a data object.

All that s necessary to implement this behavior is to set the CausesValidation property for both text boxes to true, and handle the TextBox.Validating event. The validation code for this application is shown here: private void txtName_Validating(object sender, System.ComponentModel.CancelEventArgs e) { if (((TextBox)sender).Text.Length == 0) { MessageBox.Show("You must enter a first and last name.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning); e.Cancel = true; } } You can handle the Validating event for both text boxes with the same event handler, provided you write your code generically. That means you shouldn t hard-code the control you want to check instead, retrieve a reference from the sender parameter, as in the preceding example.

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Figure 5-38. Activating Windows Select whichever method you want to use to activate Windows, and then click the Next button to continue. The most common and easiest method is to activate Windows over the Internet. You must be connected to the Internet before you select this option. You will then be presented with the option to register your copy of Windows Home Server with Microsoft, as shown in Figure 5-39. This is purely optional and doesn t affect the activation process. Choose whether or not to register, and then click the Next button to continue. If all is successful, you should then see the Thank You screen, as shown in Figure 5-40. This means that your copy of Windows Home Server is now activated, and you don t need to worry about it stopping working after 30 days! You will also notice that the Activate Windows button has now disappeared from the Resources window. You can also view the Microsoft Software License Terms (which are sometimes referred to as the End User License Agreement) by clicking the link. This will open the document for you to read. You should read the license terms at least once, just so you know what terms you need to follow in order to use the software.

Signature files give you a way of making function and value definitions private to a module. You ve already seen the syntax for the definition of a signature file in 2. A signature file can be generated using the compiler s i switch. Any definitions that appear in a signature file are public, and anyone can access them using the module. Any definitions that are not in the signature file are private and can be used only inside the module itself. The typical way to create a signature file is to generate it from the module source, and then go through and erase any values and functions that you want to be private. The signature file name must be the same as the name of the module with which it is paired. It must have the extension .fsi or .mli, and you must specify the signature file to the compiler. On the command line, you must give it directly before the source file for its module. In Visual Studio, the signature file must appear before the source file in Solution Explorer. For example, assume you have the following in the file Lib.fs:

Tip You can alter this behavior using the Form.AutoValidate property. As discussed earlier, you can prevent your validation code from running altogether (with AutoValidate.Disable). You can also allow your validation code to run, but ignore any cancel requests so that the user is allowed to tab from one control to the next (use AutoValidate.EnableAllowFocusChange). The default is AutoValidate.EnablePreventFocusChange.

Note that if you cancel a focus change in the Validating event, no other events will fire for the target control. For example, if you move to a control with invalid input and then click a button, the Button.Click event won t fire.

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