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Asked: 2026-05-11T03:29:08+00:00

I’m using a SaveFileDialog to let a user pick a directory and filename on

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I’m using a SaveFileDialog to let a user pick a directory and filename on a removeable drive. Afterwards I create that file, write to it, and close it again.

By then the file itself is not locked (editable, deleteable), but I can’t eject the drive because windows claims it is still in use. I have to exit the application before an eject is possible.

Incidentally the drive gets locked even when I only pick the file with the SaveFileDialog. Hitting ‘Cancel’ on the dialog doesn’t cause the problem

SaveFileDialog dlg = new SaveFileDialog(); dlg.DefaultExt = '.csv'; dlg.InitialDirectory = mySettings.defaultPath; dlg.Filter = '(CSV-Dateien) *.csv|'; dlg.FileName = exportDate.ToString('yyyy-MM-dd') + '.csv';  if (dlg.ShowDialog() != DialogResult.OK){     // USB-Drive is ejectable }else{     // USB-Drive is locked }
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1 Answer

  1. I found 2 Solutions:

    The Dialog changes the current working directory once the user clicks ‘save’. It’s not the file that was blocking the removable drive, but the program itself .

    So you either need to readjust the working directory once you’re done: 

    String oldDir = Directory.GetCurrentDirectory(); // ... do dialog... Environment.CurrentDirectory = oldDir;

    or you simply configure the file dialog to restore the directory before calling ShowDialog()

    dlg.RestoreDirectory = true; dlg.ShowDialog()
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