Sony Xperia C- Taking screenshot of the screen buttons ?

Hi friends, I need to know how to take screenshot on Sony Xperia C2305 mobile phone using the hardware button combinations.

This phone is running Android 4.2.2 provided by Sony.
Thanks.

In most of the Xperia Series of Sony, just press power button + volume down button together for a second and it will take screencast/ screenhost of current screen.