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The idea behind this is that the command object can be initialized on the client with any data required to perform the server-side processing. In fact, the object could do some processing or data gathering on the client before or after it is transferred to the server through the data portal. The clientside code may be as complex as needed to prepare to run the server-side code. Then the data portal moves the object to the application server and calls the DataPortal_ Execute() method in the Server-side Code region. The code in this method runs on the server and can do any server-side work. This might be something as simple as doing a quick database lookup, or it might be a complex server-side workflow. The code in this method can create and interact with other business objects (all on the server, of course). It can interact directly with the database, or any other server-side resources, such as the server s file system or third-party software installed on the server. Command objects are powerful because they provide high levels of flexibility for running both client and server code in a coordinated manner.

foreach (var instanceAgent in myRoleInstanceDiagnosticManager) { Iterates over DiagnosticMonitorConfiguration instance agents instanceConfiguration = instanceAgent .GetCurrentConfiguration(); Adds new instanceConfiguration performance counters .PerformanceCounters.DataSources.Add(CPUTime);

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The first two steps are identical, of course, but after the call to ApplyEdit(), things are quite different. Since changes to the collection are accepted rather than rejected, the changes become permanent. Child A remains marked for deletion, and if the collection is saved back to the database, the data for child A is deleted from the database. Child B is totally gone at this point. It is a new object added and deleted at edit level 1, and all changes made at edit level 1 are accepted. Since the collection knows that B was never in the database (because it was added at edit level 1), it can simply discard the object entirely from memory. Let s look at one last scenario. Just to illustrate how rough this gets, this will be more complex. It involves nested BeginEdit(), CancelEdit(), and ApplyEdit() calls on the collection. This can easily happen if the collection contains child or grandchild objects and they are displayed in a Windows Forms UI that uses modal dialog windows to edit each level (parent, child, grandchild, etc.). Again, child A is loaded from the database and child B is added at edit level 1. Finally, C is added at edit level 2. Then all three child objects are removed, as shown in Figure 13-4.

There is a relationship between an application s logical and physical architectures: the logical architecture always has at least as many layers as the physical architecture has tiers. There may be more logical layers than physical ones (because one physical tier can contain several logical layers), but never fewer.

instanceAgent.SetCurrentConfiguration(instanceConfiguration); }

The sad reality is that many applications have no clearly defined logical architecture. Often the logical architecture merely defaults to the number of physical tiers. This lack of a formal, logical design causes problems because it reduces flexibility. If a system is designed to operate in two or three physical tiers, then changing the number of physical tiers at a later date is typically very difficult. However, if you start by creating a logical architecture of three layers, you can switch more easily between one, two, or three physical tiers later on. Additionally, having clean separation between these layers makes your application more maintainable because changing one layer often has minimal impact on the other layers. Nowhere is this more true than with the Presentation layer, where the ability to switch between Windows Forms, Web Forms, Web Services, and future technologies like Windows Presentation Foundation (Avalon) is critical. The flexibility to choose your physical architecture is important because the benefits gained by employing a physical n-tier architecture are different from those gained by employing a logical n-layer architecture. A properly designed logical n-layer architecture provides the following benefits: Logically organized code Easier maintenance Better reuse of code

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