USB barcode scanner not inputting into textbox

Ok, so I have a textbox...if you focus on the textbox, I would like to be able to input information from a barcode scanner.

Trouble is...scan...nothing goes into the textbox. I can scan stuff into other programs with no problem...just not mine.

I was under the impression that I didn't need to do anything to get a USB barcode scanner to input info. What am I missing?