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The check digit is always calculated in the same way, so do you store the ISBN as a tencharacter string that s held by 10 8 bits = 80 bits, or as a nine-digit integer that can be held comfortably in 32 bits, and create the check digit programmatically when required Security: It s easier to write code that does the job required and then add security measures after the fact, but coding securely is an art in itself; in fact, it s something you should always try to do You ve already seen some good practices in earlier chapters Hide your database connection strings in Webconfig to keep them from prying eyes Try not to use the query string for values being sent to and from the database Work with multiple database servers rather than just one.

If you re using a DataReader, close it with Close() as quickly as possible Of course, you ll have to make many more trade-offs and decisions as you implement your design But rather than tread in places that have been well covered by books devoted to the topic, let s move on to the next phase of the software life cycle: testing and debugging your Web site..

Note that the radio button group is initially set so that none of the buttons are checked at the outset. To preset one of the radio buttons to be checked, use either setChecked() on the RadioButton or check() on the RadioGroup from within your onCreate() callback in your activity.

As with svn_string_t, svn_stringbuf_t is defined in svn_string.h, and there you can find numerous functions for creating, modifying, examining, and otherwise manipulating them. Again, these functions are self-explanatory, so no example has been provided.

Nothing is more annoying than installing a new application, starting to work in it, and seeing a dialog box pop up to inform you that an error has occurred and the application will now shut down. You ve now lost all the work you were doing and have given yourself a nasty injury after kicking the desk in frustration. If the application had been debugged more thoroughly, that may not have happened. This phase of the software life cycle is certainly as crucial as the others, yet it s usually written about less because it s almost impossible to describe how to debug specific errors; further, writing for the generic case isn t very helpful. However, without going into the debugging process itself, you can try to factor a handful of useful techniques into your development process.

All widgets, including the ones shown in the preceding sections, extend View, and as such, give all widgets an array of useful properties and methods beyond those already described.

In many situations, Subversion needs to function on potentially large amounts of data without holding it all in memory at any one time. To facilitate this, a generic stream object, svn_stream_t, is used. The opaque stream object itself along with various functions that operate on instances of that object are declared in svn_io.h.

Note For a complete guide to .NET debugging strategies, see Debugging Strategies for .NET Developers

by Darin Dillon (1-59059-059-7; Apress, 2003) or (if you can find it) Visual Basic .NET Debugging Handbook by Jan Narkiewicz and Thiru Thangarathinam (1-86100-729-9; Wrox Press, 2002). The latter is out of print but packed with gems of information.

Some of the properties on View most likely to be used include the following, which control the focus sequence: android:nextFocusDown android:nextFocusLeft android:nextFocusRight android:nextFocusUp Another useful property is android:visibility, which controls whether the widget is initially visible.