How to take screenshots in Counter Strike Source
(2) Hit F5 to take a screenshot of your cuurent view. The photo will be saved to your steam folder in JPG form
The screensht should be in this location “C://steamapps\yourname\counter-strike source\cstrike\screenshots\” .
If this previous Instruction didn’t work,you have to edit config.cfg that is located in:
Edit Config.cfg using any file editing tool and this command ( BIND “F5” “JPEG” )