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I have a large file upload written in Silverlight, i open the file and send chunks to a asmx web service which in turn concatenates the file chunks and creates the file. I would like to change this upload method from Silverlight to HTML 5 if possible. But is it even possible to chunk up the file in HTML 5 upload and send chunks to a web service?
Yes, its possible to send multipart forms (a.k.a file uploads) but don’t try to implement it from scratch. You would need iframe workaround for older browsers.
Try out this library: http://valums.com/ajax-upload/
Also see this answer: Sending multipart/formdata with jQuery.ajax