private void zoomPhotoButton_Click(object sender, EventArgs e)
{
Enabled = false;
pbf = new PhotoBoxForm(photoBox.Image);
pbf.FormClosed += new FormClosedEventHandler(photoForm_Closed);
pbf.ShowDialog();
}
private void photoForm_Closed(object sender, EventArgs e)
{
pbf = null;
Enabled = true;
}