bash - Startup script Problem

I am new to Ubuntu.I want to run this script every time my system reboots.Is there a way to do that?Thanks in advance for help.

# !/bin/bash
#fix resolution problem
xrandr --newmode "1440x900_60.00"  106.50  1440 1528 1672 1904  900 903 909 934  -   hsync +vsync   
xrandr --addmode VGA1 1440x900_60.00

First of all make your file executable by using this command :

chmod +x file_name

after you go to the file location

then add this line to

/etc/rc.local

here is the line:

/path/to/file/file_name

next time you restart your PC i think it will work well.