Extracting the Changed value of AdditonalPostField in Silvrlight

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Silverlight

Hi All,

I am working on Multiple file upload using Rad Upload Control.I am sending the Fileinfo of files to be uploaded through the Additonal post field from client side and reading it from the server side using Request.Form. but i want to delete the FileInfo of the uploaded file from the Fileinfo FileUploaded event to the client side after uploading the first file. I tried to send the new fileInfo from the Additional post field by removing the First key and its value and adding the new fileinfo with the same key but Request.Form is not reflecting the new value. It is showing me the First time value.Is there any way to read the Additional Pst field value except Request.Form which will reflect the new value?

Please provide me some sugession.

Thanks,
Umesh Tayade