Nobody will just send source code like that. Is this some sort of code charity?
Have you used search? i have and there are several questions in the pogramming boards relating to this.
Here is one example
http://www.codeproject.com/Messages/3310235/Text-Cahnging-Whith-BarCode-Reader-in-TextBox-Csha.aspx[
^]
Basically the scanner will just inject a string into the keyboard stream.
So it could be as simple as ensuring text box has the focus and then activate the scanner, or it could be a lot harder, and you may have to use SDK's / API's from the scanner OEM.
Go investigate, don't just scrounge.