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The IsClientConnected read-only property is quite useful if your page is performing a long query or a complex calculation. You should periodically check this property and invoke the Response.End method if the property returns False (which means that the client has closed the browser or moved to another page).

Coupling measures the level of dependency existing between two software classes. An excellent description of coupling comes from the Cunningham wiki at http://c2.com/cgi/wiki CouplingAndCohesion. Two classes, A and B, are coupled when it turns out that you have to make changes to B every time you make any change to A. In other words, B is not directly and logically involved in the change being made to module A. However, because of the underlying dependency B is forced to change; otherwise, the code won t compile any longer. Coupling measurement ranges from low to high, with the lowest possible coupling being preferable. Low coupling doesn t mean that your modules have to be completely isolated from one another. They are definitely allowed to communicate, but they should do that through a set of well-defined and stable interfaces. Each class should be able to work without intimate knowledge of the internal implementation of another class. You don t want to fight coupling between components; you just want to keep it under control. A fully disconnected system is sort of nonsense today. Conversely, high coupling hinders testing and reusing and makes understanding the system nontrivial. It is also one of the primary causes of a rigid and fragile design.

Table 26-2

Low coupling and high cohesion are strongly correlated. A system designed to achieve low coupling and high cohesion generally meets the requirements of high readability, maintainability, easy testing, and good reuse.

Description True (default) if output is buffered and sent when the page has been completely processed. This ASP property is now deprecated in favor of BufferOutput. True (default) if output is buffered and sent when the page has been completely processed. An HttpCachePolicy object that describes the current caching policy.

Functional to achieving high cohesion and low coupling is the separation of concerns (SoC) principle, introduced by Edsger W. Dijkstra in his paper On the role of scientific thought which dates back to 1974. If you re interested, you can download the full paper from http://www.cs.utexas.edu/users/EWD/ewd04xx/EWD447.PDF.

26:

SoC is all about breaking the system into distinct and possibly non-overlapping features. Each feature you want in the system represents a concern and an aspect of the system. Terms like feature, concern, and aspect are generally considered synonyms. Concerns are mapped to software modules and, to the extent that it is possible, there s no duplication of functionalities. SoC suggests that you focus your attention on one particular concern at a time. It doesn t mean, of course, that you ignore all other concerns of the system. More simply, after you ve assigned a concern to a software module, you focus on building that module. From the perspective of that module, any other concerns are irrelevant. Note If you go through the original text written by Dijkstra back in 1974, you note that he uses the expression separation of concerns to indicate the general principle, but he switches to the word aspect to indicate individual concerns that relate to a software system. For quite a few years, the word aspect didn t mean anything special to software engineers. Things changed in the late 1990s when aspect-oriented programming (AOP) came into the industry. Ignored for many years, AOP is being rediscovered today mostly thanks to some ad hoc frameworks such as Spring .NET and other Inversion of Control (IoC) frameworks.

Table 26-2

SoC is concretely achieved through modular code and making large use of information hiding. Modular programming encourages the use of separate modules for each significant feature. Modules are given their own public interface to communicate with other modules and can contain internal chunks of information for private use. Only members in the public interface are visible to other modules. Internal data is either not exposed or it is encapsulated and exposed in a filtered manner. The implementation of the

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