Xceed Upload for Silverlight

Xceed Upload for Silverlight lets you quickly and easily add multi-file upload capabilities with no limits on the amount of data being transferred to any Silverlight 4 or 3 application.

All upload operations are asynchronous, meaning that the Web page hosting your application remains perfectly responsive and usable throughout the transfer. A great alternative to ASP.NET and AJAX.Supports uploading multiple files in a single transaction, and also solves a problem inherent in the current version of Microsoft’s Silverlight technology by gathering field contents in a Silverlight form and then formatting them into a standard request that any modern Web server can understand for subsequent processing.
Being based on Microsoft’s Silverlight technology, Xceed Upload for Silverlight lets you seamlessly integrate uploaders into the beautiful and compelling end-user experience that Silverlight is all about, one that will run in multiple browser types on multiple OS types. Lets you compress data as it is being uploaded. Supports GZip and Deflate, with controllable compression level. Provides options for customizing the HTTP request and Base64 encoding, as well as a rich set of events that lets your application monitor and control every step of an upload operation.