"I'm on one of my applications. i need to generate a Code 128 and have it attached in pdf file.

Appreciate your help if you gives guide with code in vb.net"

To generate Code 128 barcodes, you can use a Code 128 font installed in your system.

You can use barcode font or barcode SDK to generate barcode on your related application. There are lots of source online.

You can use those following code with barcode control to generate code 128 barcode in vb.net:

Dim barcode As BusinessRefinery.Barcode.Linear = New BusinessRefinery.Barcode.Linear()
barcode.Symbology = BusinessRefinery.Barcode.Symbology.CODE128
barcode.Code = "0123456789"
barcode.drawBarcode("C://code-128-in-vbnet.gif")

Anyone need c# code could navigate the site as well. I've used it using visual c#.net.