Microsoft Silverlight  4.0.50401
Highlights of new features include the following:
- WCF RIA Services introduces enterprise class networking and data access for building n-tier applications including transactions, paging of data, WCF and HTTP enhancements.
- Comprehensive printing support enabling hardcopy reports and documents as well as a virtual print view, independent of screen content.
- Localization enhancements with Bi-Directional text, Right-to-Left support and complex scripts such as Arabic, Hebrew and 31 new languages including Vietnamese and Indic support.
- Read and write files to the user’s MyDocuments, MyMusic, MyPictures and MyVideos folder (or equivalent for non-windows platforms) for example storage of media files and taking local copies of reports.
- COM automation enables access to devices and other system capabilities by calling into application components; for instance to access a USB security card reader.
- Offline DRM, extending the existing Silverlight DRM powered by PlayReady technology to work offline. Protected content can be delivered with a persistent license so that users can go offline immediately and start enjoying their content.
- Enhanced databinding support increases flexibility and productivity through data grouping/editing and string formatting within bindings.
- Exclusive tooling support for Silverlight, new in Visual Studio 2010. Including a full editable design surface, drag & drop data-binding, automatically bound controls, datasource selection, integration with Expression Blend styling resources, Silverlight project support and full IntelliSense.