Most efficient way to loading multiple images

Hi,
I am wondering which will be the most efficient way in terms of memory resources, speed, etc., for loading multiple images into a form, but displaying only one at a time at certain intervals of time, like an slide show presentation.
A timer changes the current image every minute, so the speed drawing is not important. However, I would like to implement CRC checking for every image before displaying it in the form. Is there any way that I could access an Image or PictureBox Control at byte level for performing the CRC check? How efficient is to loading all images into different Image Controls, and then making visible only the current Image? Any information will be truly appreciated. Thank you.