increment the value

Question

show the barcode number below the image like 2000 and have to increase the value as 2001
if a product is closeup . in this close up we buy 100 pieces i need for 100 pieces as same barcode. now the product is colgate i need to increament the barcode number as 2001

Answer 1

asp.net using c# language. 
i need to create like this

Answer 2

Selvi

is this in .net/c#/asp/sql?

question is not cleaar