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First you need to choose the suitable barcode for your requirement. See this:
http://www.codeproject.com/Articles/690035/Choosing-the-Right-Barcode-for-Your-Application For generating barcodes, you can use barcode fonts which converts text to barcode symbols. There are fonts for several types of 1-D barcodes.
About changing the source code, I'm not sure why you need to do that. If you want to combine 2 values into one barcode, simple concatenate the 2 strings into one long string then encode it into a barcode.
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I found these plugins, but I can't change the source.. I tried everything but it doesn't work..
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