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By the way, it is OK to catch System.Exception and execute some code inside the catch block s braces as long as you re-throw the exception at the bottom of that code . Catching System.Exception and swallowing the exception (not re-throwing it) should never be done because it hides failures that allow the application to run with unpredictable results and potential security vulnerabilities . Visual Studio s code analysis tool (FxCopCmd .exe) will flag any code that contains a catch (Exception) block unless there is a throw statement included in the block s code . The Backing Out of a Partially Completed Operation When an Unrecoverable Exception Occurs Maintaining State section, coming shortly in this chapter, will discuss this pattern . Finally, it is OK to catch an exception occurring in one thread and re-throw the exception in another thread . The Asynchronous Programming Model (discussed in 27, I/OBound Asynchronous Operations ) supports this . For example, if a thread pool thread executes code that throws an exception, the CLR catches and swallows the exception and allows the thread to return to the thread pool . Later, some thread should call an EndXxx method to determine the result of the asynchronous operation . The EndXxx method will throw the same exception object that was thrown by the thread pool thread that did the actual work . In this scenario, the exception is being swallowed by the first thread; however, the exception is being re-thrown by the thread that called the EndXxx method, so it is not being hidden from the application .

The problem here is that a change between Java version 1.3.1_02 and version 1.4 might happen some time after deployment, and it may be an improvement. Either you update the JSP to support the new version and not the old one, or you enhance the tests to support a list of valid numbers, maybe substring matches. Maintenance like this after deployment is unwelcome; if you design forward-looking rules, you may find that they don t actually work six months after the go-live date when someone updates the system. It is much better to leave such versioning details to people rather than hardcoded tests. What we can do is write a JSP to list all properties, though of course a security manager may intercept that; an alternate approach would be a JSP that takes a property name as an argument and returns the value as a response. You can then query settings

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[ServiceContract] [ValidationBehavior] public interface IProductService { [OperationContract] [FaultContract(typeof(ValidationFault))] bool AddNewProduct( [NotNullValidator(MessageTemplate = "Must specify a product ID.")] [StringLengthValidator(6, RangeBoundaryType.Inclusive, 6, RangeBoundaryType.Inclusive, MessageTemplate = "Product ID must be {3} characters.")] [RegexValidator("[A-Z]{2}[0-9]{4}", MessageTemplate = "Product ID must be 2 letters and 4 numbers.")]

Summary

using System; public sealed class Point { private Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; }

CodePatronGroup. Categories of groups into which patrons are placed. These are not security groups, but general groups for reporting purposes. This was added to support grouping of patrons by units within a company, or by class/grade within a school library setting.

On the Companion CD To practice using these options, it s best to use the \Samples\0402_

CHECKPOINT; GO -- Operation INSERT INTO dbo.T1 (n, filler) SELECT n, CAST('a' AS CHAR(2000)) AS filler FROM dbo.Nums WHERE n <= 200000 AND n % 2 = 0 ORDER BY n;

Properties set directly on the element override properties from the style. This is why it s important to use TemplateBinding in templates. The style in Example 20-22 sets a default Background color of LightBlue, and the template then picks that up with a TemplateBinding, which means that when Example 20-23 sets the background to yellow, the control template picks up the new color that wouldn t have happened if the light blue background had been baked directly into the template. So the combination of styles, templates, and template bindings makes it possible to create a complete look for a control while retaining the flexibility to change individual aspects of that look on a control-by-control basis. There s one problem with our button style: it s rather static. It doesn t offer any visible response to mouse input. Most controls light up when the mouse cursor moves over them if they are able to respond to input, and the fact that our control doesn t is likely to make users think either that the application has crashed or that the button is merely decorative. We need to fix this.

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