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Set this to true to bind a control to the HelpProvider. That HelpProvider will listen for the HelpRequested event, which fires when the F1 key is pressed. At this point, it will show the appropriate Help. Use this property if you want a simple Help pop-up (which is somewhat like a tooltip) instead of using a full-fledged Help file. Set this to the text you want to show in the pop-up. Use this property if you re binding to a full-fledged Help file. You choose the part of your Help file that should be shown the index, search page, table of contents, or a specific topic. Note that the name of the Help file itself isn t set on the control. Instead, it s global to all controls that use this HelpProvider and you set it through the HelpProvider.HelpNamespace property. Used to provide context-sensitive Help with a full-fledged Help file, when HelpNavigator is set to Topic or TopicId. You set a keyword that identifies the topic for this control.

record that didn t exist, and worse, we would have no way of knowing that those old order records should be related to the new customer record. Or consider what would happen if sometime during the loop Mark Smith created another new account Then the newest customer ID would actually be an old customer ID, but our statements wouldn t know of the new changes. Clearly, a number of potential situations might cause problems for the integrity of our underlying data.

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To bind a control to this HelpProvider, you simply need to set its extended ShowHelp property to true. At this point, the HelpProvider begins monitoring the control, and shows some type of Help (depending on how you ve configured it) if the user presses the F1 key while this control has focus. You can also connect or disconnect Help manually in code, using the HelpProvider. SetShowHelp() method. Just pass the control that you want to use as an argument. // This turns on F1 help support for cmdAdd. hlp.SetShowHelp(cmdAdd, true); // This disables it. hlp.SetShowHelp(cmdAdd, false); In the following sections, you ll consider some common scenarios with the HelpProvider.

In the next chapter, which is also the last chapter of this book, you will learn how to use the codegeneration features of ODT.NET to quickly build Winforms and ASP.NET applications.

For really simple Help, you don t need to use a Help file at all. Instead, you can display a popup window with a short message (formerly referred to as What s This Help). To do so, make sure that you do not set the HelpProvider.HelpNamespace property to anything other than an empty string. Then, find the control you want to use, and supply the Help text by settings its HelpString property in the Properties window. Alternatively, you can do it programmatically by calling the SetHelpString() method, as shown here: hlp.SetHelpString(cmdAdd, "Choose another item from the catalog."); hlp.SetHelpString(cmdDelete, "Delete the selected item from your order."); Note that when you set use the SetHelpString() method, you automatically enable Help for the control. That means that you don t need to call the SetShowHelp() method (unless you want to explicitly disable Help for the control).

Those of you familiar with foreign key constraints might argue that a constraint on the customer_id field of the orders table would have prevented the inconsistency from occurring in our account merge scenario. You would be correct, of course. However, foreign key constraints can ensure only a certain level of consistency, and they can be applied only against key fields. When the number of operations executed increases, and the complexity of those operations involves multiple tables, foreign key constraints can provide only so much protection against inconsistencies. To expand, let s consider our banking transfer scenario. In this situation, foreign key constraints are of no use at all. They provide no level of consistency protection if a failure occurs after step 1 and before step 2. The database is left in an inconsistent state because the checking account has been debited but the savings account has not been credited. On the other hand, transactions provide a robust framework for protecting the consistency of the data store, regardless of whether the data being protected is in a parent-child relationship.

Tip If you set the HelpString property at design time (in the Properties window), you can employ Visual

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