BarcodeImaging is an open source library for decoding Code39, EAN, Code128, and UPC codes from a Bitmap image source. The package was built directly from a Code Project sample written originally by qlipoth and then modified by Berend Engelbrecht. I compiled the assembly directly from the source which targets framework v2 and up. Any support questions should be directed towards the project site.
$ dotnet add package BarcodeImagingNo README available.