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In this chapter you have seen why, when, and how you can use the Enterprise Library Exception Handling block to create and implement exception handling strategies. Poor error handling can make your application difficult to manage and maintain, hard to debug and test, and may allow it to expose sensitive information that would be useful to attackers and malicious users. A good practice for exception management is to implement strategies that provide a controlled and decoupled approach to exception handling through configurable policies. The Exception Handling block makes it easy to implement such strategies for your applications, irrespective of their type and complexity. You can use the Exception Handling block in Web and Windows Forms applications, Web services, console-based applications and utilities, and even in administration scripts and applications hosted in environments such as SharePoint , Microsoft Office applications, other enterprise systems. This chapter demonstrated how you can implement common exception handling patterns, such as Exception Shielding, using techniques such as wrapping, replacing, and logging exceptions. It also demonstrated how you can handle different types of exceptions, assist administrators by using unique exception identifiers, and extend the Exception Handling block to perform tasks that are specific to your own requirements.

Figure 8-9

A. WebRequestEvent B. WebAuditEvent c. WebApplicationLifetimeEvent D. WebAuthenticationSuccessAuditEvent

The last step in the design process is testing and evaluation. Until your product is tested with real users on real devices, you cannot know for certain whether it is successful. The mantra here is test early and test often. Test on real devices. Test with real users. Iterate until your product is perfect! For more information on testing, we will return to this topic in more detail later in 8.

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Presenting a core message in the best possible light is an important part of communicating what any business, organization, or department is all about. A professional look and feel says a lot about a group s standards, commitment, and even hints at the possible quality of its services. Adding a sophisticated cover page to a report, sales prospectus, or business plan can convey a solid sense of professionalism or at least attention to detail. In Office Word 2007 you can now create a professionally designed cover page in two clicks of the mouse. Click Cover Page in the Insert tab to display a gallery of cover page styles; then

This diagram shows logical instances of the Surveys application. In practice, you can implement each logical instance as multiple physical instances to scale the application

d:\asserterexample\asserter.cs(24) Blah)

Next, I ll describe the third approach to generate Nums. You start with a CTE that has only two rows and multiply the number of rows with each following CTE by cross-joining two instances of the previous CTE. With n levels of CTEs (0-based), you reach POWER(2, POWER(2, n)) rows (read as 2 in the power of (2 in the power of n) ). For example, with 5 levels, you get 4,294,967,296 rows. Another CTE generates row numbers, and nally the outer query lters the desired number of values (where row number column <= input). Remember that when you lter a row number <= some value, SQL Server doesn t bother to generate row numbers beyond that point. So you shouldn t be concerned about performance. It s not the case that your code will really generate more than four billion rows every time and then lter. Here s the code that implements this approach:

class WebActionProxy : public QObject { Q_OBJECT public: explicit WebActionProxy(QObject *parent = 0) : QObject(parent) { }; public slots: void trigger() { emit triggered(); }; signals: void triggered(); };

In ASP.NET 1.x, a cached item can be subject to four types of dependencies: time, files, other items, and other dependencies. The ASP.NET 1.x Cache object addresses many developers needs and made building in-memory webs of frequently accessed data much easier and more effective. However, this mechanism is not perfect, nor is it extensible. Like many other aspects of ASP.NET, the Cache object merely whetted developers appetites. Let s briefly consider a real-world scenario. What type of data do you think a distributed data-driven application would place in the ASP.NET Cache In many cases, it would simply be the results of a database query. But unless you code it yourself which can really be tricky the object doesn t support database dependency. A database dependency would

When you need a new sequence value, you can issue the following code:

The DNS monitoring tests can verify whether the DNS server is getting proper responses from the server to which it forwards.

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