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Silverlight 4 includes a client development model that enables accessing REST and OData end-points by simply using the Add Service Reference feature in Visual Studio 2010 to create the necessary client-side representations of the server-side data. To find your Web Data, navigate over to the odata.org site and click Producers to see what sample data is available. You will connect to the OData Test read-only dataset available at services.odata.org/OData/OData.svc/

public void upload() { Image picture = (Image) getFellow("picture"); try { Object img = Fileupload.get(); if (img instanceof org.zkoss.image.AImage) { picture.setContent((AImage)img); } else if (img != null) { Messagebox.show("Not an image: "+img, "Error", Messagebox.OK, Messagebox.ERROR); } _img = (AImage) img; } catch (InterruptedException e) { throw UiException.Aide.wrap(e); } }

To get started, right-click on Recipe 9-1 in Visual Studio and select Add Service Reference and enter the URL for the sample OData service as shown in Figure 9-1.

Clicking OK generates the necessary client-side code files to enable access to the service. Next, add a using reference to bring in the client-side code: using Ch09_LOBApplications.Recipe9_1.OdataDemoReadOnlyServiceReference using System.Data.Services.Client Then, add a MainPage_Loaded event handler on the main page where you do three things:

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Initialize the data service context to connect to the service Create a collection to store the data Define a handler for the LoadCompleted event for the collection when loaded

Here is the MainPage_Loaded event handler containing these steps: private void MainPage_Loaded(object sender, RoutedEventArgs e) { context = new DemoService( new Uri("http://services.odata.org/OData/OData.svc/", UriKind.Absolute)); Products = new DataServiceCollection<Product>(context); Products.LoadCompleted += new EventHandler<LoadCompletedEventArgs>(Products_LoadCompleted); } As you can see, you configure the context variable to point to the OData test service. Next, you instantiate a new DataServiceCollection with the Product type and assign a LoadCompleted event handler. Then you add a Button to kick off loading the data and a DataGrid to display the data in the UI. The LoadCompleted event fires when the GetProductsBtn is clicked. In the GetProductsBtn Button event, you create a LINQ query to retrieve all of the products and then pass the query in to the LoadAsync method on the Products variable of type DataServiceCollection<Product>. The LoadAsync method uses the context variable to know where to retrieve the data from. Here is the GetProductsBtn_Click event handler: private void GetProductsBtn_Click(object sender, RoutedEventArgs e) { ProductsGrid.DataContext = null; var ProductsQuery = from products in context.Products select products; Products.LoadAsync(ProductsQuery); } When LoadAsync completes, the DataServiceCollection.LoadCompleted event is fired on the Products variable, which checks for an error; if no errors are present, it assigns the data to the ProductsGrid.ItemSource property as shown in Listing 9-1.

Note The org.zkoss.zul.Fileupload class provides utilities to allow a user to upload a file from the browser. The get method shows a dialog that prompts the user to specify the file to upload.

For experienced programmers, there are certain technologies that are considered somewhat more hard-core than others, simply because they are, well, harder to do well. Again, this is a pretty weak indicator, but all else being equal, I m more impressed by someone who has done work in OCaml than someone who has worked in Java. Assembler or device-driver or kernel work is somewhat more impressive than Visual Basic or PHP. C++ with ATL is harder than Perl. People who have worked on operating systems or compilers are more hard-core than people who have worked on simple database front-ends. I m sure that this will be seen as incendiary; after all, most of my personal programming experience in the past five years is with VBScript, which is sort of like a version of Visual Basic dumbed down for people with severe brain trauma. Remember again that I said that resumes are a very weak way of judging programmers, and you only get the faintest signals from them; that said, some technologies are just harder than other technologies, and if you happened to have worked with them successfully, there s a smidgen more evidence that you might be the right person to hire, so for the purpose of sorting resumes, difficult technologies

Listing 9-1. The Recipe 9-1 Products_LoadCompleted Method void Products_LoadCompleted(object sender, LoadCompletedEventArgs e) { if (e.Error == null) { // Load all pages of Orders before binding. if (Products.Continuation != null)

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