How to generate the barcodes for any product ?

You can try generate barcode in .net.
This library supports generate barcodes in asp.net or in Winforms or reports like Crystal Reports, RDLC etc.
And users are free to customize barcode properties, including barcode size , barcode text fonts, barcode rotation,etc according to your needs.

barcode font or barcode library, if you do not have specific settings for barcode, font may suit you. barcode library generates barcode as image which is easy to be customized. anyway, it all up to you.

Bar-codeis is a Font type. There is no need to do special code for that.