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class SomeClass { // ToString is a virtual method defined in the base class: Object. public override String ToString() { // Compiler uses the call IL instruction to call // Object s ToString method nonvirtually. // If the compiler were to use callvirt instead of call , this // method would call itself recursively until the stack overflowed. return base.ToString(); } }

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Comment on the routine s limitations If the routine provides a numeric result, indicate the accuracy of the result. If the computations are undefined under some conditions, document the conditions. If the routine has a default behavior when it gets into trouble, document the behavior. If the routine is expected to work only on arrays or tables of a certain size, indicate that. If you know of modifications to the program that would break the routine, document them. If you ran into gotchas during the development of the routine, document them too. Document the routine s global effects If the routine modifies global data, describe exactly what it does to the global data. As mentioned in Section 13.3, modifying global data is at least an order of magnitude more dangerous than merely reading it, so modifications should be

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Protected Sub cbDisplayPhoto_CheckedChanged( _ ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles cbDisplayPhoto.CheckedChanged imgPhoto.Visible = cbDisplayPhoto.Checked End Sub

dates. Of course, the rst constraint makes no sense in real world, and the rst design was bad anyway. However, it was normalized. Remember that you can constrain with the data model itself with table design. Often a repeating group of columns with similar names really represents a hidden collection; however, don t decompose such groups automatically. Check the business rules the constrained predicates rst.

For the presentation tier, we ll discuss the Model-View-Controller (MVC) pattern. For the persistence tier, we ll introduce the Entity Access Object (EAO) pattern, a version of the Data Access Object pattern, updated for JPA. For the application or business logic tier, the Session Fa ade pattern will be covered. (Sorry, but there s no cool acronym for this pattern )

Tips and Tricks Earlier in the chapter, I presented some tips and tricks that can make your native debugging life easier I want to finish up with a few tips that will help you when debugging assembly language Endians The endianness of a CPU refers to which end of a byte is stored first Intel CPUs are Little Endian, which means that the little end of a multibyte value is stored first For example, the value 0x1234 is stored in memory as 0x34 0x12 It's important that you keep the Little Endian storage in mind when you're looking at memory in the debugger You'll need to convert it in your head so that you're interpreting the correct values.

UPDATE dbo.T1 SET col2 = 'Version 1' WHERE keycol = 2;

HttpWebRequest req = (HttpWebRequest) WebRequest.Create("http://oreilly.com/"); req.UserAgent = "Mozilla/5.0 (iPod; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Mobile/5H11a"; ... as before

Contains critical information about possible physical injury; be sure to read this information carefully.

For string-based searches, you need to be able to perform case-insensitive matching and matches on fragments of strings in restriction expressions.

If you already know how to use Photoshop, you should be able to follow the imageediting instructions without any difficulty because of the functional similarity between GIMP and Photoshop. If you have Adobe Photoshop, you probably already know how to create the banner headline you want. Try to make the banner graphic around 150 pixels tall and around 800 pixels across. That will mean most browsers will be able to view it without a problem. Feel free to use any of Photoshop s capabilities to throw in some visual flourish to the template graphics. With source code, a detour away from a tutorials detailed path is likely to cause problems. Improvisation in graphics tutorials, in contrast, seldom creates any difficulties. To create the banner, fire up GIMP and select the Xtns menu. You will see a submenu labeled Script-Fu. This submenu contains a large number of scripted extensions for GIMP that perform macro operations to automate graphic tasks. In the Script-Fu menu, you will see an option for Logos. The Logos menu has numerous scripts for the quick and simple generation of banner logos. In Figure 6-27, you can see that I have selected the Chrome logo to create my banner.

Instances of a particular class may be immutable. For example, in CaveatEmptor, a Bid made for an item is immutable. Hence, no UPDATE statement ever needs to be executed on the BID table. Hibernate can also make a few other optimizations, such as avoiding dirty checking, if you map an immutable class with the mutable attribute set to false:

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