Hello Rajesh Krishnamohan,
If you are using Silverlight to upload a file, the file is divided to small chunks which are uploaded and reassembled into the AsyncUploadTemporary folder.
If you are using Flash or IFrame the file is uploaded into an ASP.NET temporary folder and after that is moved to the AsyncUploadTemporary folder. That difference to upload process with Flash/IFrame is because we have no control of the overall upload process. If you want to disable upload with Silverlight please add this snippet to your code:
the Telerik team