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However, it does have a few shortcomings when compared to rules: Duplication: Rule values are duplicated every time the workflow is implemented If you re only using the workflow in one or a few lists or document libraries, this may not be a big deal Versioning: With the form approach, there is no (easy) way to track and control the values that are applied to a specific instance Control: Using rules, specifically in the way we are going to cover in this chapter, will allow you to define and manage the rules centrally Auditing: In highly regulated environments, it may be necessary to be able to report on or verify the specific rules that were implemented at a certain point in time.

the search for the handler for this particular exception should be continued (a value other than 1), because this filter doesn t know what to do with this particular exception. endfinally (endfault) (0xDC). The lexical end of a finally or fault block. This instruction clears the evaluation stack.

The approach we are going to take in this chapter could easily be extended to support full auditing and reporting by treating the rules as records and utilizing the full record-management capabilities of MOSS So with that understanding of when and why to use rules, let s begin our investigation..

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Because the business object type was passed in as a parameter, it can be used directly, rather than calling MethodCaller.GetObjectType(), like in the Fetch() method. Following this approach, when the Create() call is delegated to the proxy object (and thus to Csla.Server.DataPortal and the other server-side code), the object type is passed as a parameter: result = proxy.Create(objectType, criteria, dpContext) This way, the type of business object to be created flows from the Csla.DataPortal through to the server-side code.

Open Visual Studio 2005 and create a new Class Library project named Csla. I recommend immediately saving the project using File Save All. Make sure the option to create a directory for the solution is checked, as shown in Figure 3-1. Of course, the Class1.cs file needs to be removed in preparation for adding the classes that belong to the framework.

After the first time the page is requested, the actual markup produced during page processing is put into the Output Cache. In this event trap, the ASP .NET runtime examines the details of the request, and sees if there s a corresponding entry in the cache. When it finds a matching entry, the runtime retrieves that pregenerated HTML from the cache, and sends it down the output stream. An instance of the Page object that would normally handle the request is never even created. This can improve the performance of your application by many orders of magnitude. Output caching can be declared at the UserControl level as well, allowing you to cache static portions of your page, while dynamically generating the parts that are unique across users and requests. The VaryByParam attribute, when used with the value of *, results in a different entry in the cache for each unique value carried in the URL as a query string, and for each different form value in an HTTP Post. This powerful facility can be used to cache each unique version of a page, even if its content is dynamically generated based on input variables such as these. While output caching is highly recommended, as it can vastly improve the performance of your site, this event is not a common one to trap and extend the pipeline with.

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