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Editorial Team
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Asked: 2026-05-21T17:43:17+00:00

How can I determine if the file the user is uploading is closed before

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How can I determine if the file the user is uploading is closed before pressing the upload button when using a FileUpload Dialog control in C# ASP.net. This will prevent the user from pushing a file with unsaved data to the server for processing.

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1 Answer

  1. Editorial Team

    AFAIK, you can’t. The file will either:

    • A) Be pushed without flushed changes, or
    • B) Cause a problem if the file can’t be opened to push the content (i.e. open with a lock of sorts) – the point at which this occurs is most likely within the ‘Open file’ dialog, however, so a user system issue.
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