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Many prominent web sites have published Silverlight 1 and Silverlight 2 applications that are media focused as a result of Silverlight s strong client-side media capabilities, such as HD video coupled with a Windows Media Services back end. Many other sites also publish interactive content beyond video; but for corporate development support of traditional Create, Read, Update, and Delete or CRUD applications, as well as data-driven rich Internet applications, you need a strong control set with rich data support. Silverlight 1 is limited to a JavaScript development model with graphics primitives that can be built up to provide controls. Silverlight 2 continues to support the JavaScript development model but also adds a rich control set with the .NET Framework for Silverlight. This has been further enhanced with the Silverlight Toolkit published on CodePlex, which is available here: http://www.codeplex.com/Silverlight Silverlight 3 introduces additional controls outlined in 1. In addition, Silverlight 3 introduced the new Silverlight Navigation Application project template, which provides a great starter application for a line-of-business (LOB) application. We covered the Silverlight Navigation Application basics in 6 because it also provides great integration with the browser history and support for direct page links. When you think LOB applications, you automatically think n-tier development. We discussed Silverlight s strong network service capabilities in 7. A framework that was introduced at Mix 09 in beta that we have not covered yet is Microsoft .NET Rich Internet Applications (RIA) Services.

Figure 18-15. The exception is caught and the ResolveAll method is called. By default, the LINQ to SQL framework uses optimistic conflict detection. As the name suggests, the framework is optimistic that nothing is changed when SubmitChanges is called, so no locks are applied to the underlying database tables. You can change to pessimistic conflict detection using the TransactionScope class contained in the System.Transactions.dll assembly. With the pessimistic mode, the application locks the table until an update is complete. Here is an example of using pessimistic conflict detection: AdventureWorksDataContext db = new AdventureWorksDataContext(); using (TransactionScope ts = new TransactionScope()) { CountryRegion zzRegion = (from r in db.CountryRegions where r.CountryRegionCode == "ZW" select r).Single(); zzRegion.Name = "Zimbabwe_"; db.Log = Console.Out; Console.ReadLine(); db.SubmitChanges(); ts.Complete(); }

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Note RIA Services is available as a Community Technology Preview (CTP) when Silverlight 3 released. However, based on user feedback, Microsoft has removed production restrictions typical with a CTP. You are free to use RIA Services in applications, but it does not have the typical official go live support license. You can find more information here: http://timheuer.com/blog/archive/2009/06/09/ria-services-roadmapupdated.aspx.

In this coding scenario, we extended the previous scenario and showed how you can use the powerful binding features of Silverlight to decouple your business logic from procedural code. Utilizing this method allows you to create business algorithms that can be reused in other pages, unit tested, and set in XAML while remaining very performant.

By running this code twice, and then pressing a key in both console applications, you will update the database without errors from one console, while the other console will raise an exception. Figure 18-16 shows the output.

You can download the Microsoft .NET RIA Services July 2009 Preview here: http://www.microsoft.com/downloads/details.aspx FamilyID=76bb3a07-3846-4564-b0c327972bcaabce&displaylang=en Data is easily accessible on the server in ASP.NET and easy to display on the presentation layer with Silverlight 3. However, the effort required to implement data flow between tiers with change tracking and validation is not trivial.

BI developers need to understand this concept well. Each time you mix business logic with procedural code, you are stepping closer to unmaintainable code. BI applications evolve and will add additional configurations, calculations, aggregates, and algorithms as you work with the data. Decoupling these algorithms from the main application functionality allows developers to simply plug these new algorithms into their applications without interfering with existing code that has been already verified by the users or your development quality assurance team.

A very important LINQ to SQL framework behavior is deferred query execution. With deferred query execution, a query you define in your code is not executed until you use a loop to iterate through the IQueryable<T> collection or until you invoke particular methods, such as Single, ToList, and many others that use the collection for you. When you write the query in your code, you just define it; there is no SQL statement execution until you loop through the collection s items. To demonstrate this behavior, run the following code, putting a breakpoint just after the query definition, on the foreach statement. AdventureWorksDataContext db = new AdventureWorksDataContext(); db.Log = Console.Out; IQueryable<CountryRegion> query = from r in db.CountryRegions select r; foreach (CountryRegion region in query) { Console.WriteLine(region.Name); } Figure 18-17 shows the results.

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