When you upload an image (file) to the server - the server gets the bytes stream of that image, so you can manipulate the stream like, create Image from that stream, manipulate it, and save it on the file-stream. (and all this is done on server-side.) You may read more about the RadUploadHandler here
, and get the ide of how to get the Image stream.
But you'd better re-size the image on the client and send it after that. That way you'll generate much smaller traffic and save server's overhead. You can read more on this here
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