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In order to override a method, you need to create a custom inherited control. For example, imagine you have a text box that s designed for numeric entry, and you want to examine every key press to make sure that it corresponds to a number, and not a letter. To perform this type of task, you can create a customized text box, and override the OnKeyPress() method to add this extra verification logic. public class NumericTextBox : System.Windows.Forms.TextBox { protected override void OnKeyPress(KeyPressEventArgs e) { base.OnKeyPress(e); if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar)) { e.Handled = true; } } } The OnKeyPress() method is invoked automatically by the Windows Forms engine when a key is pressed in a TextBox control. The overridden method in the preceding example checks to see if the entered character is a number. If it isn t, the Handled flag is set to true, which cancels all further processing, effectively making sure that the character will never end up in the text box.

In this chapter, we ve rocketed through a number of fairly significant concepts and issues surrounding both data access fundamentals and what makes indexes tick. Starting with an examination of physical storage media and then moving into the logical realm, we looked at how different pieces of the operating system and the database server s subsystems interact. We looked at the various sizes and shapes that data can take within the database server, and what mechanisms the server has to work with and manipulate data on disk and in memory. Next, we dove into an exploration of how indexes affect both the retrieval of table data, and how certain trade-offs come hand in hand with their performance benefits. We discussed various index techniques and strategies, walking through the creation of a simple index structure to demonstrate the concepts. Then we went into detail about the physical layout options of an index and some of the more logical formatting techniques, like hashing and tree structures. Finally, we finished with some general guidelines to keep in mind when you attempt the daunting task of placing indexes on your various tables. Well, with that stuff out the way, let s dig into the world of transaction processing. In the next chapter, you ll apply some of the general data access concepts you learned in this chapter to an examination of the complexities of transaction-safe storage and logging processes. Ready Okay, roll up your sleeves.

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Note When overriding a method, it s a good practice to call the base class implementation, which may have some required functionality. More commonly, the base class implementation simply raises the associated event (in this case, KeyPress), allowing other objects to handle it. You ll learn more about overriding methods when you build derived controls in 11.

The following list contains some of the main reasons why you might want to use the ODT.NET AQ features in your project: You can save time not having to manually write the DDL to create a queue, queue table, agent and subscriber. You can visually browse and explore the queues you have hosted in your database at any point in time.

n the past, the database community has complained about MySQL s perceived lack of transaction management However, MySQL has supported transaction management, and indeed multiple-statement transaction management, since version 323, with the inclusion of the InnoDB storage engine Many of the complaints about MySQL s transaction management have arisen due to a lack of understanding of MySQL s storage engine-specific implementation of it InnoDB s full support for all areas of transaction processing now places MySQL alongside some impressive company in terms of its ability to handle high-volume, mission-critical transactional systems As you will see in this chapter and the coming chapters, your knowledge of transaction processing concepts and the ability of InnoDB to manage transactions will play an important part in how effectively MySQL can perform as a transactional database server for your applications.

This design pattern is useful if you use a number of controls with extremely similar behavior. It allows you to create a custom control that you can use whenever you need this set of features. If, on the other hand, you need to fine-tune behavior for distinct, even unique tasks, this approach is much less useful. For example, consider a button control. You could react to a button click by creating a special class for every button on your application, and giving each button its own overridden OnClick() method. Although your program would still work well, it would quickly become completely disorganized, swamped by layers of button classes that have little to do with one another. To circumvent this problem, .NET uses the view-mediator pattern, as described in the next section.

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