One of the most frustrating things you run into when working with image files, Images objects, and PictureBoxes is that once you release your application, some users will get “file locked” errors when trying to manipulate files that you have displayed onto the screen via a picturebox. Finding a workaround can be downright maddening: It is sometimes hard to replicate the problem, and it is difficult to open an image and display it without displaying the image you have just opened from a file 
.