Accidentally Deleted Photos from SD Card

"Hello! Can anybody give me some suggestion to recover photos after deleting from an SD card? I mistakenly deleted some precious photos on my SD card for Canon digital camera. Today, I connected my SD card to my computer via a card reader because I want to transfer those photos to my computer. However, I mistakenly click the Delete option and delete all the photos from my SD card. I don’t know if I still have chance to get back the deleted photos, but they are really very important to me. Any kind help will be highly appreciated!"