/* background worker for updating image and add upc code image */
private void backgroundWorkerUpdate_DoWork(object sender, DoWorkEventArgs e)
{
// start doing work
photo.StartUpdate();
upc.AddGlobalUpc();
}
/* background worker for adding all upc photos */
private void backgroundWorkerUpdate_DoWork(object sender, DoWorkEventArgs e)
{
image.AddGlobalUpc();
}