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htm"); To save yourself some work when using this technique with the HelpProvider, you would probably retrieve these values from the HelpProvider For example, you might provide a button on your form that invokes the default form Help: private void cmdHelp_Click(object sender, SystemEventArgs e) { HelpShowHelp(this, hlpHelpNamespace, hlpGetHelpNavigator(this), hlpGetHelpKeyword(this)); } Similarly, you might use a right-click context menu for a control that provides the control s default Help: private void mnuHelp_Click(object sender, SystemEventArgs e) { Control ctrl = mnuLabelSourceControl; HelpShowHelp(ctrl, hlpHelpNamespace, hlpGetHelpNavigator(ctrl), hlpGetHelpKeyword(ctrl)); } This menu event handler is written using the SourceControl property, which means it s generic enough to be used with any control When the menu is clicked, it retrieves the control attached to the context menu, and gets its assigned Help keyword.

Figure 15-10. Editing the TableAdapter SQL query It s now time to use your strongly typed DataSet! Add a new form to your project. Let s say you wanted to display the data in a DataGridView control. How do you go about that Simply drag the DataSet from the Data Sources window into the form! Once you drag the DataSet into your form, you will notice that ODT.NET has created a nice DataGridView control for you, complete with record navigation controls, a button to insert new data to the table, a button to delete existing data from the table, and even a Save button to save updates made in the grid. This can be seen in Figure 15-11. What is even cooler is that ODT.NET has done all the underlying work of mapping the DataSet to the grid! You can in fact run this form as it is without having to write any further line of code.

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Now that you are this far, it s possible to unshackle yourself completely from the HelpProvider class Just handle the HelpRequested event of any form or control Then launch the appropriate Help programmatically with the Help class Now that you ve seen how it can be done, why would you want to do it You ll examine two of the most common reasons in the next two sections..

Note MySQL allows you to explicitly roll back the statements executed inside a transaction to the beginning of

Help files, like any other external resource, change (or need to be localized). You don t want to embed information such as topic URLs all over your user interface, because they are difficult

the transaction demarcation or to marks called savepoints (available as of version 4.0.14 and 4.1.1). If a savepoint is marked, a certain segment of the transaction s statements can be considered committed, even before the COMMIT terminating instruction is received. (There is some debate, however, as to the use of savepoints, since the concept seems to violate the concept of a transaction s atomicity.) To mark a savepoint during a set of transactional statements, issue a SAVEPOINT identifier command, where identifier is a name for the savepoint. To explicitly roll back to a savepoint, issue a ROLLBACK TO SAVEPOINT identifier command.

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and time-consuming to update. Instead, you can use a basic form event handler that calls a method in a custom AppHelp class. It would look something like this: private void form1_HelpRequested(object sender { Global.Help.ShowHelp(this); } HelpEventArgs e)

Be default, MySQL creates a transaction wrapper for each SQL statement that modifies data it receives across a user connection. This behavior is known as autocommit mode. In order to ensure that the data modification is actually committed to the underlying data store, MySQL actually flushes the data change to disk after each statement! MySQL is smart enough to recognize that the in-memory data changes are volatile, so in order to prevent data loss due to a power outage or crash, it actually tells the operating system to flush the data to disk as well as make changes to the in-memory buffers. Consider the following code from our previous bank transfer example: mysql> UPDATE account WHERE customer mysql> UPDATE account WHERE customer SET balance = balance 100 = 'Jane Doe' AND account = 'checking'; SET balance = balance + 100 = 'Jane Doe' AND account = 'savings';

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