Updates content of the zip file item.
A string that is the path to the file which will replace the file in the archive.
A ZipFileItem object that is the updated zip file item.
The UpdateFile method removes a file item located at the path which equals the path to the file without the root component. Then, the ZipArchive creates a new zip file item from the specified file and adds it to the archive at the same path.
If an item is not found, it is created.