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If you look at your bank statement or your credit card statements, you ll see that you have unique identifiers associated with you for the institution in the form of an account number If you have multiple accounts, you have unique numbers for each of the accounts These are unidirectional identifiers The text of the law also discusses correlation handles, which are identifiers through which someone s identity could be ascertained across different systems In the United States, your Social Security number is a key correlation handle It is an identifier used to identify you when you re taking on a new job, when filing taxes, when obtaining credit, and so on It would be easy to integrate data from any two organizations that had your Social Security number.

If you have a large list, you need to avoid these triggers to ensure good performance. Even when you re using UI virtualization, you still have to pay the price of instantiating your in-memory data objects. For example, in the 50,000-item ListBox example, you ll have 50,000 data objects floating around, each with distinct data about one product, customer, order record, or something else. If you want to optimize this portion of your application, you can consider using data virtualization a technique where you fetch only a batch of records at a time. Data virtualization is a more complex technique, because it assumes the cost of retrieving the data is lower than the cost of maintaining it. This might not be true, depending on the sheer size of the data and the time required to retrieve it. For example, if your application is continually connecting to a network database to fetch more product information as the user scrolls through a list, the end result may be slow scrolling performance and an increased load on the database server. Currently, WPF does not have any controls or classes that support data virtualization. However, that hasn t stopped enterprising developers from creating the missing piece: a fake collection that pretends to have all the items but doesn t query the back-end data source until the control requires that data. You can find solid examples of this work at http://bea.stollnitz.com/blog/ p=344 and http://bea.stollnitz.com/blog/ p=378.

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WPF 3.5 SP1 improved the virtualization story with item container recycling. Ordinarily, as you scroll through a virtualized list, the control continually creates new item container objects to hold the newly visible items. For example, as you scroll through the 50,000-item ListBox, the ListBox will generate new ListBoxItem objects. But if you enable item container recycling, the ListBox will keep a small set of ListBoxItem objects alive and simply reuse them for different rows by loading them with new data as you scroll. <ListBox VirtualizingStackPanel.VirtualizationMode="Recycling" ... > Item container recycling improves scrolling performance and reduces memory consumption, because there s no need for the garbage collector to find old item objects and release them. Once again, this feature is disabled by default for all controls except the DataGrid to ensure backward compatibility. If you have a large list, you should always turn it on.

To further improve scrolling performance, you can switch on deferred scrolling. With deferred scrolling, the list display isn t updated when the user drags the thumb along the scroll bar. It s refreshed only once the user releases the thumb. By comparison, when you use ordinary scrolling, the list is refreshed as you drag so that it shows your changing position. As with item container recycling, you need to explicitly enable deferred scrolling: <ListBox ScrollViewer.IsDeferredScrollingEnabled="True" ... /> Clearly, there s a trade-off here between responsiveness and ease of use. If you have complex templates and lots of data, deferred scrolling may be preferred for its blistering speed. But otherwise, your users may prefer the ability to see where they re going as they scroll.

Another key ingredient in any data binding scenario is validation in other words, logic that catches incorrect values and refuses them. You can build validation directly into your controls (for example, by responding to input in the text box and refusing invalid characters), but this low-level approach limits your flexibility. Fortunately, WPF provides a validation feature that works closely with the data binding system you ve explored. Validation gives you two more options to catch invalid values: x

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