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Note Currently, the GetProducts() method doesn t include any exception handling code, so all exceptions will bubble up the calling code. This is a reasonable design choice, but you may want to catch the exception in GetProducts(), perform cleanup or logging as required, and then rethrow the exception to notify the calling code of the problem. This design pattern is called caller inform.

This code retrieves a table of product information from the Store database, which is a sample database for the fictional IBuySpy store included with some Microsoft case studies. (You can get a script to install this database with the downloadable samples for this chapter.) The query is performed through a stored procedure in the database named GetProducts. The connection string isn t hard-coded instead, it s retrieved through an application setting in the .config file for this application. (To view or set application settings, double-click the Properties Settings.settings node in the Solution Explorer.) Figure 8-4 shows two tables in the Store database and their schema.

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Figure 8-4. A portion of the Store database You have several options for making the StoreDB class available to the forms in your application: The form could create an instance of StoreDB whenever it needs to access the database. You could change the methods in the StoreDB class to be static. You could create a single instance of StoreDB, and make it available through a static property in another class (following the factory pattern). The first two options are reasonable, but both of them limit your flexibility. The first choice prevents you from caching data objects for use in multiple forms. Even if you don t want to use that approach immediately, it s worth designing your application in such a way that it s easy to implement later on. Similarly, the second approach assumes that you won t have any instancespecific state that you need to retain in the StoreDB class. Although this is a good design principle, there are some details (like the connection string) that you might want to retain in memory. If you convert the StoreDB class to use static methods, it becomes much more difficult to access different instances of the Store database in different back-end data stores. Ultimately, the third option is the most flexible. It preserves the switchboard design, by forcing all the forms to work through a single property. Here s an example that makes an instance of StoreDB available through the Program class: public static class Program { private static StoreDB storeDB = new StoreDB(); public static StoreDB StoreDB { get { return storeDB; } }

This is the number one cause of unresponsive GUIs You can see this in action in the following example that creates a GUI that could easily become unreactive because it tries to do too much computation on the GUI thread This example also illustrates how to ensure your GUI remains reactive by making a few simple changes You will look primarily at a useful abstraction called the BackgroundWorker class, which you find in the SystemComponentModel namespace This useful class allows you to run some work, raising a notification event when this work is complete This is especially useful for GUI programming because the completed notification is raised on the GUI thread This helps you enforce the rule that GUI objects should only be altered from the thread that created them.

Figure 6-8. The account has been created for you. You should now repeat the entire process to create a user account for every person who will need access to your Windows Home Server, although you are limited to ten accounts, not including the Guest account. If you try to create more than ten accounts, you will receive a warning telling you that you have reached the maximum number of user accounts, as shown in Figure 6-9.

ActiveX control used in previous versions of Visual Basic, although the masking language is very similar.

You can set the mask for a MaskedTextBox using one of several prebuilt choices at design time. Just click the ellipsis ( ) next to the Mask property in the Properties window (or click Set the Mask Associated with This Control in the smart tag for the MaskedTextBox). A dialog box named Input Mask will appear (see Figure 18-7), with a list of commonly used masks (for phone numbers,

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