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Figure 22-12. Collapsible Help for one window You don t need any proprietary tricks to get this feature it s all in the HTML you write for the Help topics. To implement the approach shown in Figure 22-12 you simply need a script that finds the corresponding section of the HTML document and tweaks its visibility. The only subtlety to understand with form-based Help is that when you enable Help for the form, you also enable Help for every control it contains. If the user presses F1 while the focus is on a control that is specifically configured with different Help settings, these settings take precedence. If, however, the current control has ShowHelp set to false, the request will be forwarded to the containing form, which launches its own Help. This process works analogously with all container controls, and it allows you to define Help that s as specific as you need while being able to fall back on a generic form-wide topic for controls that aren t specifically configured.

TRANSACTION command marks the start of a transaction. If you are using a version of MySQL before 4.0.11, you can use the older, deprecated command BEGIN or BEGIN WORK.

Tip The online samples for this chapter (in the Source Code area of www.apress.com) include a HelpTest project that shows a simple project with three windows. Each of three windows uses a different granularity of Help: form-based, frame-based, and control-based. You can run this application with the included Help file to get a better understanding of the options you have for linking context-sensitive Help to an application.

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Figure 15-8. Editing a generated DataSet You will be brought to the window shown in Figure 15-9 where you can visually see the details of the DataSet object. As you can see, there is already an adapter object created for the DataSet. This adapter object retrieves all rows from the table by default. Right-click it, and choose the Configure menu item.

The examples so far require the user to press the F1 key. This automated approach doesn t work as well if you want to provide your own buttons that allow the user to trigger Help when needed. Sometimes, that sort of prominent reminder can reassure the user that Help is nearby.

2. This is not quite true, since certain SQL commands, such as ALTER TABLE, will implicitly force MySQL to mark the end of a current transaction. But for now, let s just examine the basic process the database server is running through.

To trigger Help programmatically, you need to use the static ShowHelp() method of the Help class (in the SystemWindowsForms namespace) The Help class works analogously to the HelpProvider in fact, the HelpProvider uses the Help class behind the scenes when the user presses F1 There are several overloaded versions of the ShowHelp() method The simplest requires a Help file name (or URL) and the control that is the parent for the Help dialog (this second parameter is required for low-level Windows operating system reasons) Here s an example that shows the testhlp file: HelpShowHelp(this, "testhlp"); Additionally, you can use a version of the ShowHelp() method that requires a HelpNavigator, one that requires a keyword, or one that requires both a keyword and a HelpNavigator Here s an example that could be used for context-sensitive Help: HelpShowHelp(this, "testhlp", HelpNavigatorTopic, "about.

Figure 15-9. Configuring TableAdapter settings When you have done that, a new window will be displayed. You will initially see that the default SQL retrieves all results from the table. Add a filter (a WHERE clause) to the SQL statement, as shown in Figure 15-10. When you have done that, click the Finish button. Visual Studio will regenerate the corresponding data access objects.

Regardless of the number of distinct actions that may compose the transaction, the database server must have the ability to undo changes that may have been made within the container if a certain condition (usually an error, but it could be any arbitrary condition) occurs. If something happens, you need to be able to undo actions that have occurred up to that point inside the transactional container. This ability to undo changes is called a rollback in transaction processing lingo. In MySQL, you inform the server that you wish to explicitly undo the statements executed inside a transaction using the ROLLBACK command. You roll back the changes made inside the transaction wrapper to a certain point in time.

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