Visual Basic Barcode to csv

I need a quick and fast application that works with my barcode scanner (shows up as a H.I.D) there are two fields one is for the shelf and the other is the tag number which is a contains 7 characters once the 7 digit number is detected the app will write the info to a csv file and will set focus back on the tag textbox the output should be in the shelf,tag format I want the shelf number to stay the same till a new one is scanned in. I need this in a hurry with source code, prefer visual basic.