Hello Khurram Ilyas,
RadUpload do not support this functionality - it only sends the file to the server. You can check this blog post to see how to implement this:
http://social.msdn.microsoft.com/Forums/en-US/silverlightdeveloper/thread/3a164592-d41d-4c63-9df9-ac5afaa8900a
Regards,
Valentin.Stoychev
the Telerik team
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