You can export the barcode to an image
and try to add it in a drawing context
along with the original image. Then render the context and save it to a file. Note that the UIElement which will be exported should be measured and arranged before the export. Otherwise, an exception will be thrown. Also, keep in mind that the bitmap doesn't support alpha (transparency) and depending on the approach used for the export the transparent Background of the barcode could be change to black. This is why I recommend setting a Background to the barcode before exporting it.
I hope this information is useful.
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