swfupload

Large File uploading to asp.net MVC

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I need a way to upload large files (600 mb to 4 gb) in an asp.net mvc website.
Currently I am using swfupload; it works well enough, but it is a huge hit on the webserver because it sends it in one big upload, plus I have to set it in the web.config to allow that huge of a file, which is a huge security risk. In the past when I was doing web forms development I used Neatupload which breaks up the file into chunks and uploads them individually. I am looking for a way to upload large files in mvc that uploads via chunking it up. Any ideas on how I could do this?

ASP.Net session state not available on another webpage

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I’m designing a single page web application with all the action happening on default.aspx. I store the user’s user id in Session after he logs on. I use SWFUpload in default.aspx to upload files to upload.aspx.
When upload.aspx receives a file, it checks HttpContext.Current.Session for the user’s id. This used to work, but since recently HttpContext.Current.Session doesn’t have any values regarding my session. I must have changed something along the line but I have no idea what.