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So my question is pretty straight-forward. I need to upload about 600 files and more (of PDF and CSV type), but the ASP.NET FileUpload control only allows me to select 518 files. Once I select more than 518, it says 'No file chosen'. Does anybody know why this could happen? Is there maybe a limit on the number of files that can be selected at a time? The number of files that I'll be uploading every month will increase, so I could reach 1000 files soon.

Your help is greatly appreciated. Morné.

Morné Lombard
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  • So just to make it clear, the problem occurs on the client only, before submitting the request to the server? – Alex Paven May 11 '17 at 09:48
  • Correct. I only select the files from the file selection dialog, nothing more. – Morné Lombard May 11 '17 at 09:50
  • Haven't used webforms in quite a while so I don't have a ready answer for you, but if it's client side then you should be able to debug the javascript and find the source of the problem that way; let me try it real quick. – Alex Paven May 11 '17 at 09:52
  • Sounds more like a Browser and/or html limitation to me since a FileUpload is nothing more than a html input type="file". – VDWWD May 11 '17 at 09:57
  • True, see http://stackoverflow.com/questions/15851751/what-is-the-max-number-of-files-to-select-in-an-html5-multiple-file-input so it may depend on browser and length of filenames – Alex Paven May 11 '17 at 09:59
  • Did a quick test, I can upload at least 1700+ files at once. (1 kb plain text files for testing, localhost, firefox) – VDWWD May 11 '17 at 10:04
  • Failed with around 3k files on chrome, but with short file names. IE doesn't fail outright but I can't see how many it selects, it cuts off at around 1.5k. Edge cuts off under 2k. Regardless, I would argue that uploading that many files through the browser is problematic and should be avoided... – Alex Paven May 11 '17 at 10:11
  • Awesome thanks so much for the valuable information guys! I guess making use of a different jQuery file upload plugin won't make a difference? My client is used to the file name format, so I can't change that unfortunately. Unless there is some sort of file upload API that I can use. The other option would be to allow the user to upload the files in batches of 50-100 files or so. – Morné Lombard May 11 '17 at 10:15

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