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You also have the option to show deleted items in SCE. This will show the item grayed out and noted as deleted. By default this is off. Finally, there is a Configure User Tools section. This allows you to specify your own tools (as opposed to the default tools provided for you by VSTS). It allows you to specify your own Merge or Compare tools. For example, Diff Doc is a popular (and free) tool for comparing Microsoft Word documents. Figure 3-35 shows the settings for DiffDoc.exe.

s To prevent a field from being edited, set the IsLocked property of the text box to True or, better yet, Tip

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Since exposing collections from an object is such a common activity in .NET development, the .NET Framework has provided three base classes to do this: Collection<T>, ReadOnlyCollection<T>, and KeyedCollection<K,V>. There is really nothing new to learn about these collections. All they implement is the minimum functionality required for accessing collections, which we have already gone over in detail. The Collection<T> class is the base class for simple generic collections and provides implementations for the IList<T>, ICollection<T>, IEnumerable<T>, IList, ICollection, and IEnumerable interfaces. The ReadOnlyCollection<T> class is the base class for simple generic read-only collections and provides implementations for the IList<T>, ICollection<T>, IEnumerable<T>, IList, ICollection, and IEnumerable interfaces. Unlike Collection<T> class, there are no properties or methods to update the collection. The KeyedCollection<K,V> is an abstract class, inherited from Collection<T>, for simple generic key/value collections. Microsoft suggests that you return one of these three types of collections from your objects if you want to provide a standard, plain-vanilla collection API.

As you ve seen, you can bind other elements to the SelectedItem property of your list to show more details about the currently selected item. Interestingly, you can use a similar technique to build a master-details display of your data. For example, you can create a window that shows a list of categories and a list of products. When the user chooses a category in the first list, you can show just the products that belong to that category in the second list. To pull this off, you need to have a parent data object that provides a collection of related child data objects through a property. For example, you could build a Category product that provides a property named Category.Products with the products that belong to that category. (In fact, you can find an example of a Category class that s designed like this in 18.) You can then build a master-details display with two lists. Fill your first list with Category objects. To show the related products, bind your second list the list that displays products to the SelectedItem.Products property of the first list. This tells the second list to grab the current Category object, extract its collection of linked Product objects, and display them. You can find an example that uses related data in 18, with a TreeView that shows a categorized list of products. You ll see two versions of the example one that uses Category and Product objects, and one that uses the ADO.NET DataRelation object.

Figure 3-35. Diff Doc tool settings The arguments for various tools can be somewhat confusing and difficult to configure. James Manning at Microsoft has an excellent blog describing how to configure different tools at http://blogs.msdn.com/jmanning/articles/535573.aspx.

Summary

Of course, to complete this example, from an application perspective you ll need to supply some code. For example, you might need an UpdateProducts() method that accepts your collection or products and executes the appropriate statements. Because an ordinary .NET object doesn t provide any change tracking, this is a situation where you might want to

Custom check-in policies allow you to specify your own constraints, which must be met before items can be checked in. Creating a check-in policy is fairly straightforward. The example presented here was originally written by Jeff Atwood of Vertigo Software (you can check out his blog at http://blogs.vertigosoftware.com/jatwood/default.aspx) and was helped along by James Manning.

consider using the ADO.NET DataSet (as described a little later in this chapter). Alternatively, you might want to force users to update records one at a time. (One option is to disable the list when text is modified in a text box and force the user to then cancel the change by clicking Cancel or apply it immediately by clicking Update.)

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