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Figure 13-2. How DAOs are created by the Abstract Factory The DAO makes use of two GoF patterns, the Factory Method and Abstract Factory patterns. The Abstract Factory pattern encapsulates a group of similarly themed individual factories. It can be used by calling code to create specific concrete objects. Since the calling code will always work with generic objects, and not the specific objects themselves, it never needs to be aware of the details of their implementation. For example, an abstract factory might generate specific SQL Server or Oracle DAO objects (via the appropriate factory methods) depending on certain arguments provided, but what is handed back to the calling code is always a generic DAO object. This allows the calling code to access the underlying database (without having to care which type of database it is) through a generic interface. In the following few sections we take a look at Microsoft s Enterprise library, which implements a Microsoft SQL Server DAO and an Oracle DAO (based on Microsoft s Oracle Provider).

// Report progress only if there is a change of 1% // Also, don't bother performing the calculation if there // isn't a BackgroundWorker or it doesn't support progress notifications if ((i % iteration == 0) && (backgroundWorker != null) && backgroundWorkerWorkerReportsProgress) { backgroundWorkerReportProgress(i / iteration); } } Now the only remaining step is to respond to the ProgressChanged event and update a progress control in the status bar: private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) { progressPanelValue = eProgressPercentage; } Figure 20-8 shows the progress meter while the task is in progress..

When you start up the MySQL Administrator program, you are greeted with the dialog box shown in Figure 15-3.

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.NET 2.0 adds a new TextRenderer class (in the System.Windows.Forms namespace), which implements a slightly different model for text rendering. Essentially, the TextRenderer draws text using GDI (or Uniscribe for non-Western characters) rather than GDI+. There are a few reasons why you might prefer to use the TextRenderer instead of the standard Graphics.DrawString() method: The rendering quality for international text has been improved regularly. As a result, GDI draws better quality text than GDI+ when using these complex scripts. Similarly, if the Windows operating system is updated to support new languages, the GDI drawing methods will draw these scripts correctly while GDI+ likely will not, even with the correct font. The Windows Forms controls often use GDI. In some cases (possibly when extending one of these controls), you might want to draw text that matches exactly. If you use GDI+, the alignment and smoothing may differ subtly but noticeably. GDI+ locks font files for the duration of the application s lifetime, making it difficult to update fonts. Using the TextRenderer class is easy, as it exposes only two methods: MeasureText() and DrawText(), although there are multiple overloads of both. Here s an example that draws text using the TextRenderer when a Paint event fires:

Microsoft s huge research and development team comprises a division called the Patterns and Practices group. They ve released version 4.1 of the Microsoft Enterprise Library (dated October 2008), which is basically a collection of reusable software components (termed application blocks) based on what they believe to be best practices. These application blocks implement a mixture of GoF design patterns and other design concepts. One of these application blocks is the data access application block (DAAB), which we will look at shortly. You can download (and install) the library from this location: http://www.microsoft.com/downloads/details.aspx FamilyId=1643758B-2986-47F7-B5293E41584B6CE5&displaylang=en.

desktop environment. Although you may notice slight variations in the MySQL Administrator functionality, depending on the operating system you use, the interface runs in a very similar fashion on Windows and Macintosh operating systems. See http://dev.mysql.com/downloads/ for the version for your system.

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