ImageButton save imagebutton image/object to database

Hi, hope I can get some help here - I am trying to save an ImageButton image to my database. Basically, get the imagebutton image/value and convert it to byte[] and save the bytes to the database. I know how to save the bytes to the db, but don't know how to get the imagebutton image/object to convert to bytes. I have tried everything, but no luck.