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API for Microsoft Silverlight. The ArcGIS API for Silverlight enables you to create rich internet and desktop applications that utilize the powerful mapping, geocoding, and geoprocessing capabilities provided by ArcGIS Server and Bing™ services.
The API is built on the Microsoft Silverlight platform which is integrated with Visual Studio 2010 and Expression Blend 4. The Microsoft Silverlight platform includes a lightweight version of the .NET Framework CLR (CoreCLR) and the Silverlight runtime - all hosted via a browser plugin. Silverlight 5: Working with Operating System Windows. In previous versions of Silverlight, we didn't have the ability to create new operating system windows.
If we wanted to pop up content over our other application, we had to use the Popup element, or the derived ChildWindow control. Those were great, but didn't act as operating system windows. Specifically, they couldn't escape the bounds of your main application. Please note that this article and the attached sample code was written using the Silverlight 5 Beta, available at MIX11 in April 2011, and updated for the Silverlight 5 RC. ChildWindow controls are great for most things, but sometimes you just want something that acts like an operating system Window.