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In an ASP.NET environment, the process is controlled by web.config and your IIS virtual root settings. Your web server s virtual root must be configured to disallow anonymous access. The result is that the user must log into the website using his Windows credentials to access any pages. Obviously, this means the web server is authenticating the user s credentials. You also need to configure ASP.NET to use Windows authentication and impersonation: <authentication mode="Windows" /> <identity impersonate="true" /> If you only tell ASP.NET to use Windows authentication, it relies on the web server to do the work but doesn t change the current principal and identity to match that user on every page request. By setting both values, ASP.NET relies on the web server to handle authentication and then impersonates the identity of that user. In many ways, integrated Windows authentication is the simplest approach. But it isn t always practical because many applications allow users that aren t in the Windows domain or Active Directory to log in, and so some form of custom authentication is required.

The preceding scenario works when you can control the producer and you have a closed loop. But what if you don t own the producer, or there are too many producers for you to make them also manage a counter In this case, you can use a return receipt, or a work complete receipt. In this approach, as work is completed, a message is sent through a separate channel, perhaps another queue, back to the producer. This alerts the producer that the work is done. This is common in scenarios where the process takes a long time to complete, and the producer wants an asynchronous notification when the work is done. Instead of using a return queue, we ve also had the consumer call a small notification web service on the producer side, sending a simple message regarding the status of the work. This makes the consumer an active part of the process, and it removes the need for the producer to monitor a queue and become a consumer itself.

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on a continual basis during the whole process However, once you think the object model is complete, you should always pause to review it for performance issues One primary performance issue with many object models deals with the use of relational thinking when designing the objects Normalizing data within the object model is perhaps the most common flaw causing performance issues Due to the design of ProjectResource, ResourceAssignment, and Assignment, the object model has already eliminated this issue by normalizing behavior instead of data This helps avoid loading entire business objects just to display a couple of common data elements There is, however, another performance issue in the model The ProjectList and ResourceList collection objects, as modeled, retrieve collections of Project and Resource business objects so that some of their data can be displayed in a list.

Queues are decidedly one-way They re a way for one or more producers to communicate with one or more consumers, but not the other way around Using one queue in this manner is an asymmetric queue Generally, in an asymmetric queue, the producer finds out about the work being completed in a passive way The new file happens to be in the right place when the user hits Refresh, or the customer receives an email when the order is shipped, or any number of other scenarios As was discussed in section 1652 about work complete receipts, someProducer (website) times using symmetric queues can be 1 Consumer useful This makes the response from 2 (the backend) the consumer back to the producer an active one.

Custom authentication means that you are responsible for getting the user s credentials (often a username and password) and ensuring they are valid. The most common way to check the credentials is by comparing them to values in a database table. People also use the ASP.NET MembershipProvider

Based on the use cases, the user then selects one of the objects and chooses to view, edit, or remove that object From a purely object-oriented perspective, it s attractive to think that you could just load a collection of Project objects and allow the user to pick the one he wants to edit However, this could be very expensive, because it means loading all the data for every Project object, including each project s list of assigned resources, and so forth As the user adds, edits, and removes Project objects, you would potentially have to maintain your collection in memory too Practical performance issues dictate that you re better off creating a read-only collection that contains only the information needed to create the user interface (This is one of the primary reasons why CSLA NET includes the ReadOnlyListBase class, which makes it very easy to create such objects.

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