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In the ZK Pet Shop, when the user clicks the upload button, a dialog box pop up prompting the user to upload the file. After uploading, a pet s icon appears in the right cell of the upload button, showing the image uploaded by the user. Listing 6-8 creates the upload button and registers an onClick event listener that invokes the win.upload() method when the button is clicked by the user. The win.upload() method renders a small icon of the pet s photo uploaded by the user into the image component.

Silverlight 4 includes strong network service capabilities (refer to 7). In this chapter, we highlight additional networking support for accessing data in a structured way via both WCF Data Services and WCF RIA Services. The next two sections provide a high-level overview of these two technologies. For a deeper discussion on these technologies and how they relate to other SOAP and REST-based development models, please go to:

blogs.msdn.com/endpoint/archive/2010/01/04/wcf-data-services-ria-services-alignmentquestions-and-answers.aspx.

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Silverlight 4 includes rich support for accessing web data either on the Internet or intranet via WCF Data Services. Formerly known as ADO.NET Data Services in Silverlight 3, WCF Data Services provides support for REST-based data access as well as support for the new Open Data Protocol (OData) format. You can learn more about OData at www.odata.org/ Silverlight 4 introduces several improvements for WCF Data Services including a new DataServiceCollection class that provides better data binding support with automatic updates to bound controls and greatly simplifying REST development in Silverlight. WCF Data Services also supports both out-of-browser and cross-domain execution in Silverlight 4.

When you think LOB applications, you automatically think n-tier development. Introduced at Mix 09 in beta as Microsoft .NET Rich Internet Applications (RIA) Services, the name has changed to WCF RIA Services but the goal is the same, which is to simplify the development of n-tier solutions for Silverlight RIA applications. WCF RIA Services is automatically installed when you download and install the Silverlight 4 Tools for Visual Studio 2010. The challenge with n-tier applications is flowing data across application tiers with support for edits, validation, and so on. WCF RIA Services builds on the capabilities covered in 7 to provide a framework that enables you to rapidly build Silverlight LOB n-tier applications. WCF RIA Services provides a bridge between Silverlight 4 s rich presentation-tier capabilities and ASP.NET s powerful middle-tier capabilities on the server, including support for ASP.NET authentication and user settings management. To get started with WCF RIA Services, you create classes in the middle-tier web application that inherit from the System.Web.DomainServices.DomainService base class to define a set of operations on resources such as an ADO.NET Entity Model or other resources such as a user registration service. You can have classes on the middle tier be available on the client-side in Silverlight by adding the EnableClientAccess attribute to the middle-tier classes. WCF RIA Services will automatically generate the corresponding client-side code into the presentation tier (the Silverlight application). At this point, you can code against the generated client-side code without worrying about tracking and packaging up changes and so forth to pass back to the middle tier. WCF RIA Services manages this for you.

<row> <hbox>*Image File: <button id="image" label="upload" onClick="win.upload()"/> </hbox> <image id="picture" width="100px" height="77px"/> </row>

Create an instance of the OpenFileDialog class, and display it to the user with the ShowDialog method. You can send the files to the server for processing, but we recommend that you let the user know anytime a file is sent to the server.

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