barcode how to program ?

Refer to this

http://www.c-sharpcorner.com/blogs/generate-barcode-and-barcode-reader-for-sale-and-purchase1

if still any question then u can ask

Hi,

Check the following links:

Scan barcode: 

http://www.c-sharpcorner.com/UploadFile/dacca2/generate-barcode-using-spire-barcode-library/

Generate barcode: 

http://www.c-sharpcorner.com/UploadFile/38268a/generating-qr-code-in-C-Sharp/

A bar code (often seen as a single word, barcode) is the small image of lines (bars) and spaces that is affixed to retail store items, identification cards, and postal mail to identify a particular product number, person, or location.

have a look of the link

http://www.aspdotnet-pools.com/2015/03/how-to-create-code-128-barcode-label.html

Hi,

Please follow below links -

http://www.aspose.com/docs/display/barcodenet/How+to+Save+Retrieve+Barcodes+to+and+from+Database+in+.NET

http://www.c-sharpcorner.com/uploadfile/krishnasarala/barcode-scanner-in-c-sharp/

http://www.c-sharpcorner.com/uploadfile/krishnasarala/generating-barcode-in-C-Sharp/