According to ISO/IEC barcode specification, Code 128 only encode ASCII 128 characters. So, you may firstly make sure your encoded barcode data is correct. Besides, some googled C# barcode library can use process tilde character to encode other ASCII character in Code 128 barcode.
if there is something wrong with your barcode generator , you can change for another and have a try. i have used this barcode generator for times and i don't know whether it can generate code 128, you can just have a check , good luck!
According to ISO/IEC barcode specification, Code 128 only encode ASCII 128 characters. So, you may firstly make sure your encoded barcode data is correct. Besides, some googled C# barcode library can use process tilde character to encode other ASCII character in Code 128 barcode.
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