Can you use sand disk memory card with canon powershot a540 camera?

SanDisk is a brand of memory card. The Canon A540 takes a certain type of card, see its instrucvtion book, probably it's a CompactFlash, but it may be a SecureDigital (SD). Take the camera to a pghoto retsailer and get the right card - many cameras are fussy about just which manifestation of card they can accept. SanDisk will almost certainly make a card to suit your camera.