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At this point, you should understand the four interfaces implemented by editable objects to support data binding. Some of these interfaces INotifyPropertyChanged and IEditableObject, in particular interact with any parent collection that might contain the object. I ll discuss data binding and collections next.

Note The sample project SOAPSender.csproj (contained within the solution SOAPRouter.sln) allows you

group by is a bit different from the other parts of select, so you need to use your imagination a little to wrap your head around it. Figure 3-7 illustrates the process. Operationally, group by sits in between the where clause and the select clause. group by takes the output of where and splits it into groups of rows that share a common value (or values) for a specific column (or columns). These groups are then passed to the select clause. In the example, there are 15 different food types (type_id ranges from 1 to 15), and therefore group by organizes all rows in foods into 15 groups varying by type_id. select takes each group, extracts its common type_id value, and puts it into a separate row. Thus, there are 15 rows in the result, one for each group.

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Collections need to implement a set of interfaces to fully participate in data binding, and these interfaces are quite complex. Fortunately, Microsoft provides the BindingList(Of T) class in the System. ComponentModel namespace, which already implements all the interfaces. To help you fully understand the benefit provided by this class, Table 10-3 lists the interfaces you would otherwise have to implement by hand.

Defines a ListChanged event that should be raised when the list changes, along with methods to support in-place editing in a grid, sorting, and other features Defines methods used for in-place editing in a grid Indicates that the list will raise a ListChanged event when its child items raise PropertyChanged events

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to toggle between a direct Web service call and an indirect one via a SOAP router (see StockTraderProxy.cs, Line 38). If you modify the URL for the Web service request, you must also modify the SoapActor attribute on the target Web service method to reflect the same target URL (see StockTrader.asmx, Line 33, in the SOAPService project). If you do not, you will receive addressing errors because the <to> header on the request must match the Actor attribute on the receiver. The sample projects contain clear notes describing how to toggle the SoapActor attribute in response to a different target URL from the sender.

Another common approach is to put all the business logic into the interface control code. The data is validated and manipulated by the interface control code, and the Data Storage and Management layer just stores the data. This approach, as shown in Figure 1-11, is common in both Windows and web environments and has the advantage that the business logic is centralized into a single tier (and of course, one can write the business logic in a language such as C# or VB .NET).

Figure 3-7. group by process When group by is used, the select clause applies aggregates to each group separately, rather than the entire result as a whole. Since aggregates produce a single value from a group of values, they collapse these groups of rows into single rows. For example, consider applying the count aggregate to the preceding example to get the number of records in each type_id group: sqlite> select type_id, count(*) from foods group by type_id; type_id ---------1 2 3 count(*) ---------47 15 23

Unfortunately, in practice, the business logic ends up being scattered throughout the application, thereby decreasing readability and making maintenance more difficult. Even more important, business logic in one form or page isn t reusable when subsequent forms or pages are created that use the same data. Furthermore, in a web environment, this architecture also leads to a totally noninteractive user experience, because no validation can occur in the browser. The user must transmit his data to the web server for any validation or manipulation to take place.

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Note ASP.NET validation controls at least allow for basic data validation in the interface, with that validation automatically extended to the browser by the ASP.NET technology itself. Though not a total solution, this is a powerful feature that does help.

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