public void DeletePicture(int pictureId) { // Code to find the picture by ID and delete it }
public void DeletePicture(string filename) { // Code to find the picture by filename and delete it }
public void DeleteAllPictures(string directory) { // Code to find all pictures in the directory and delete them }The IPictureService interface is a custom interface, and the package library would depend on the implementation of the interface.