saveFileDialog1.FilterIndex = 0;
if (pictureBox1.Image == null)
{
MessageBox.Show("沒有預覽圖片");
}
else if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
if (pictureBox1.Image != null)
{
pictureBox1.Image.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Bitmap);
}
}