In general this FileExist event is fired when you have either TargetFolder
set and OverwriteExistingFiles
property is set to False.
If you save your files to a database, this event won't prevent files with duplicating names to be saved. This event is used only when the files are saved on the file system.
Since you haven't provided the code used to insert records to a database, my suggestion is the following. In this button click event handler function you will check, if there is already a file with such name and if so you will change the name of the currently uploaded file manually and then save it to the database.
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