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The HttpSessionState class provides a dictionary-based model of storing and retrieving session-state values. Unlike HttpApplicationState, this class doesn t expose its contents to all users operating on the virtual directory at a given time. Only the requests that originate in the context of the same session that is, those generated across multiple page requests made by the same user can access the session state. The session state can be stored and published in a variety of ways, including in a Web farm or Web garden scenario. By default, though, the session state is held within the ASP.NET worker process. The ASP.NET implementation of session state provides some extremely handy facilities such as support for cookieless browsers, Web farms, and Web gardens and the capability of being hosted by external processes, including Microsoft SQL Server. In this way, ASP. NET session management can provide an unprecedented level of robustness and reliability. Developers can also create custom data stores for session state. For example, if you need the robustness that a database-oriented solution can guarantee but you work with Oracle databases, you need not install SQL Server as well. By writing a piece of additional code, you can support an Oracle session data store while using the same Session semantics and classes. The extensibility model for session state offers two options: customizing bits and pieces of the existing ASP.NET session state mechanism (for example, creating an Oracle session provider or a module controlling the generation of the ID), and replacing the standard session state HTTP module with a new one. The former option is easier to implement but provides a limited set of features you can customize. The latter option is more complicated to code but provides the greatest flexibility.

Simplicity is a characteristic that is often associated with ASP.NET MVC. If you look at Figure 1-8, you can hardly contest the point ASP.NET MVC is architecturally simpler than Web Forms because the sequence of steps to process a request follows closely the rules of the underlying protocols, with no abstractions created by the framework. This is a correct statement, but it is a bit incomplete. ASP.NET MVC processes a request through an action and passes return values to a view engine. In doing so, though, ASP.NET MVC offers a number of free services that you might or might not need. For example, when a form posts its content, the framework attempts to bind posted data to the formal parameters of the action method in charge of serving the request. There s a lot of reflection involved in this approach, and some work is done that might not strictly be needed. Can you opt out of this model binding, and how easy is it to do so This is the point that shows why ASP.NET MVC targets simplicity in a much more effective way than Web Forms.

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Note There are too many device information settings to be included in this book. However, you can learn more about the settings available for each rendering extension by reviewing the topic Device Information Settings in Reporting Services Books Online.

In ASP.NET MVC, opting out of a built-in feature simply requires that you use a different coding convention. There s nothing to disable and no closure to crack open to get a different behavior. Any complexity in ASP.NET MVC is built in a bottom-up manner, by composing layers of code one on top of the other. At any time, you can step back and remove the topmost layer to replace it or simply do without it. In Web Forms, opting out of any built-in feature is much harder because the framework was deliberately built around them in a top-down manner. You can still create HTML-based pages in Web Forms, but it will be significantly hard and counterintuitive. To alter the default behavior of Web Forms, you have to resort to tricks or override methods. In ASP.NET MVC, you just change your programming style or simply replace the component.

ASP.NET Web Forms was relatively easy to embrace for developers and software professionals. ASP.NET MVC requires a bit of extra work and doesn t really lend itself to being learned and discovered on a trial-and-error basis. So how high is the barrier to get into the world of ASP.NET ASP.NET Web Pages offers a new approach. ASP.NET Web Pages is not a framework aimed at professional developers, but still it is part of the ASP.NET platform and will be updated in the future. Let s find out more.

execute, and the volume of data returned by the query may be overwhelming You should ensure that reports that request data from a degenerate dimension include a filter so that only a relatively few members are requested It s common to filter a report containing a degenerate dimension by day or hour, by individual, or by transaction Degenerate dimension attributes are usually values that provide an alternative to the fact table primary key as a way to uniquely identify a fact record Examples include a prescription number, a point-of-sale system transaction number, or an inventory control number These attributes are rarely used for analysis, but may be useful for reporting or filtering For example, you wouldn t want to group by transaction line-item numbers, but you might want a report that shows transaction line-item numbers, quantity, and amount for a customer .

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