convert image from encrypted image

Hi, I have use web service.in webservice area(i have converted dataset to xml)then encypt the xml and return that xml.In windows area i get after decrypt that xml.and read xml to dataset.so i get original record.except image,the image column will show some large bytes like 4AAQSkZJRgABAQEBgAGAAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL so i want convert image.