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Refresh column. Selecting No indicates that the item will never be published, and selecting Refresh Only indicates that the item will be refreshed, but no changes you make to the item will ever be published.

The process of debugging a Windows service is a little different from the generic Windows Forms application or console application, since you do not start or execute the service via the main() method. Fortunately, all is not lost, as you have two techniques for debugging your Windows service. Which debugging process you use depends on what functionality you are trying to test.

Some developers build error checking directly into their data objects. For example, here s a modified version of the Product.UnitPrice property that disallows negative numbers: Public Property UnitCost As Decimal Get Return unitCost End Get Set If value < 0 Then Throw New ArgumentException("UnitCost cannot be negative.") Else unitCost = value OnPropertyChanged(New PropertyChangedEventArgs("UnitCost")) End If End Set End Property The validation logic shown in this example prevents negative price values, but it doesn t give the user any feedback about the problem. As you learned earlier, WPF quietly ignores data binding errors that occur when setting or getting properties. In this case, the user won t have any way of knowing that the update has been rejected. In fact, the incorrect value will remain in the text box it just won t be applied to the bound data object. To improve this situation, you need the help of the ExceptionValidationRule, which is described next.

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The first process is outlined in the many C# books out there that cover Windows services: attach the debugger to the service after it is running. This allows you to use all the standard debugging features available on Visual Studio 2005. The process, while straightforward, is, as far as I m concerned, far from intuitive. But once you know the steps, you can replicate it for any Windows service. To attach the debugger to a Windows service requires the following steps: 1. Start your Windows service using the Services application or your own custom service control application. 2. Select from the main Visual Studio 2005 menu Debug and then the menu item Attach to Process. This will display a dialog box similar to the one in Figure 14-13.

This updates Team Foundation Server and if you added any items will return the Work Item ID to populate the project schedule.

Whether or not it s a good approach to place validation logic in a data object is a matter of never-ending debate. This approach has some advantages for example, it catches all errors all the time, whether they occur because of an invalid user edit, a programming mistake, or a calculation that s based on other invalid data. However, this has the disadvantage of making the data objects more complex and moving validation code that s intended for an application s front end deeper into the back-end data model. If applied carelessly, property validation can inadvertently rule out perfectly reasonable uses of the data object. They can also lead to inconsistencies and actually compound data errors. (For example, it might not make sense for the UnitsInStock to hold a value of 10, but if the underlying database stores this value, you might still want to create the corresponding Product object so you can edit it in your user interface.) Sometimes, problems like these are solved by creating yet another layer of objects for example, in a complex system developers might build a rich business object model overtop the bare-bones data object layer. In the current example, the StoreDB and Product classes are designed to be part of a back-end data access component. In this context, the Product class is simply a glorified package that lets you pass information from one layer of code to another. For that reason, validation code really doesn t belong in the Product class.

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