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You can actually skip this step if you are developing with Visual Studio 2005, because it will dynamically generate the proxy class file for you when you add a Web reference (for your Web service) to a client project. However, we prefer to manually generate the proxy class file so that we can either alter it or have it ready for clients who are using a development tool without code-generating wizards.

Figure 10-3. Incorrect WPF display when using the Windows Forms model In Figure 10-3, the user sets the total due to 190 and then changes the credit limit from 5,000 to 50. Obviously, the Total Due control now exceeds the credit limit and should be invalid, but no visual cue is provided for the user. The object also needs to raise a PropertyChanged event for AmountDue, so data binding refreshes that property s display. If there s a PropertyChanged event for CreditLimit and TotalDue, the visual display will look like Figure 10-4.

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To produce the top ten foods, we needed an order by in the first select statement. Since compound queries allow only one order by at the end of the statement, we got around this by performing an inner join on a subquery in which we computed the top ten most common foods. Subqueries can have order by clauses because they run independently of the compound query. The inner join then produces a relation containing the top ten foods. The second query returns a relation containing all foods in episodes 3 through 5. The intersect operation then finds all matching rows. The except operation takes two relations, A and B, and finds all rows in A that are not in B. By changing the intersect to except in the previous example, you can find which top ten foods are not in seasons 3 through 5: select f.* from foods f inner join (select food_id, count(food_id) as count from foods_episodes group by food_id order by count(food_id) desc limit 10) top_foods on f.id=top_foods.food_id except select f.* from foods f inner join foods_episodes fe on f.id = fe.food_id inner join episodes e on fe.episode_id = e.id where e.season between 3 and 5 order by f.name; id type_id name ----- ------- -------192 8 Banana 133 7 Bosco 288 10 Hot Dog As mentioned earlier, what is called the except operation in SQL is referred to as the difference operation in relational algebra.

In this case, the user did exactly the same thing, but when she reduced Credit Limit and tabbed out of that control, the Total Due control immediately showed that it was in error. You can implement this in BusinessBase with a configuration setting in Csla.ApplicationContext.

This final step hooks a client to your Web service. If you are using Visual Studio 2005, simply add a (dynamic) Web reference to the Web service in your client project, and this will automatically generate the proxy class file for you. This wizard will also make the necessary adjustments to your application configuration file to record the location of the Web service. Alternatively, you can manually add the proxy class file from step 5 to your project, update the configuration file, and begin coding. The client essentially does nothing more than delegate method calls to the Web service. Valid clients include Web applications, Windows Forms applications, console applications, or even other Web services.

Compound queries are useful when you need to process similar data sets that are materialized in different ways. Basically, if you cannot express everything you want in a single select statement, you can use a compound query to get part of what you want in one select statement and part in another (and perhaps more) and process the sets accordingly.

There s no universal way for a business object to know that it is data bound to a WPF form or a Windows Forms form, so you need to tell CSLA .NET which type of data binding is being used so the framework can adapt. You can do this by setting a config value in the app.config file in the appSettings section, as shown here: <add key="CslaPropertyChangedMode" value="Xaml" /> or in code, as shown here: Csla.ApplicationContext.PropertyChangedMode = _ Csla.ApplicationContext.PropertyChangedModes.Xaml If set in code, the value should be set exactly once, as the application starts up. The default mode is Windows, which is necessary for backward compatibility with existing CSLA .NET code. This means that all WPF applications should set this property as shown, either in the config file or in code.

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