c# image memory class

I have a document management system that manages images and indexes that point to those images. The images are stored on the disk and not in a database mainly because there are 100's of millions of images. I need to load about 2000 of them in memory so that I may move them around(up and down) in the array. This will move the image and the path to that image up and down in array. I need a class that is optimized to be able to put these tiff, jpg images in memory and move them around. The class will have two properties, the image itself and the location (physical path) where the image is located. The project will basically be an array of images then methods to move images up and down in that array. This is not a complicated project I just do not have the time to write this class as I am working on other parts of this project. On disk and compressed the images are from 30K to 200K. These images in most case are only 300x300 dpi bitonal. I am not dealing with lossless png's or anything like that. Memory will not be an issue. The will be single page tiffs and not multipage. Thank you and good luck bidding.