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This shows us the additional information that is being collected when these events occur . Finally, we can explore where the information for these events is being sent by executing the following command:

SELECT groupid, CASE WHEN MIN(cnt) = MAX(cnt) THEN AVG(1.*val) ELSE MIN(val) END AS median FROM GroupedTiles GROUP BY groupid;

empid ----------3 7 9 11 12 13 14 empname ------------------------Ina Aaron Rita Gabriel Emilia Michael Didi lvl ----------0 1 2 2 3 3 3

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I just explained how delegates can be used to call static methods, but they can also be used to call instance methods for a specific object . To understand how calling back an instance method works, look at the InstanceDelegateDemo method that appears in the code shown at the beginning of this chapter . Notice that a Program object named p is constructed in the InstanceDelegateDemo method . This Program object doesn t have any instance fields or properties associated with it; I created it merely for demonstration purposes . When the new Feedback delegate object is constructed in the call to the Counter method, its constructor is passed p.FeedbackToFile . This causes the delegate to wrap a reference to the FeedbackToFile method, which is an instance method (not a static method) . When Counter calls the callback method identified by its fb argument, the FeedbackToFile instance method is called, and the address of the

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Automatic Memory Management (Garbage Collection)

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Java requires a single public class definition per source file but allows any number of nonpublic classes. The file name must match the public class name with the .java extension. C# permits any number of public and nonpublic classes to be contained in a single source file. The source file can have any valid operating system name independent of the classes it contains. If more than one class contains a Main method, the application entry point must be specified at compile time by using the /main flag. Compiler options are discussed in 3.

document.open(); writer.getAcroForm().setNeedAppearances(appearances); TextField text = new TextField(writer, new Rectangle(36, 806, 559, 780), "description"); text.setOptions(TextField.MULTILINE); if (font) { BaseFont unicode = BaseFont.createFont( "c:/windows/fonts/arialuni.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); text.setExtensionFont(BaseFont.createFont()); ArrayList<BaseFont> list = new ArrayList<BaseFont>(); list.add(unicode); text.setSubstitutionFonts(list); } text.setText(TEXT); writer.addAnnotation(text.getTextField()); document.close(); }

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Because this sample code uses the Visual Basic Val function to preprocess the usersupplied data, it almost always works without error. Any data considered invalid is simply converted to zero. Another option would be to chastise the user for invalid entry before processing occurs, to validate the supplied values. The five validators in the Validation section of the Web Forms toolbox help you do just that: The RequiredFieldValidator confirms that the user supplied any value at all in a control. The RangeValidator complains if a control s value does not fall between two values. The RegularExpressionValidator lets you compare a control s value against a regular expression pattern. For instance, you could compare the user s entry of a serial number to a pattern to ensure that it included two letters followed by five digits.

users preferences do not always go along with them. Therefore, if you allow a lot of personalization for users of your site, you need to allow the users to log on and reset their cookies. Doing so should then re-enable their customizations, assuming that you have them stored elsewhere.

3

Table 11-4

Lightweight application containers like the Spring Framework and PicoContainer popularized the idea of DI. To learn more about the roots of DI itself, visit www.martinfowler.com/articles/injection.html. This article, by Martin Fowler, faithfully examines the pros and cons of DI over JNDIstyle manual lookups. Since the article was written before EJB 3 was conceived, you might find the discussion of EJB 2 cool as well!

<ItemGroup> <Compile Include="Form1.cs" /> <Compile Include="Form1.Designer.cs" /> <Compile Include="Program.cs" /> <Compile Include="Properties\AssemblyInfo.cs" /> </ItemGroup>

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