getting GDI+ generic error while saving the image

Question

My problems is that I can't overwrite the image I've opened recently. So, let's imagine I'm opening the file with openfiledialog:

OpenFileDialog OpenFileDialog1 = new OpenFileDialog();

OpenFileDialog1.InitialDirectory = "c:\\";
OpenFileDialog1.Filter = "Images|*.GIF;*.TIF;*.JPG;*.BMP";
OpenFileDialog1.RestoreDirectory = true;

if (OpenFileDialog1.ShowDialog() == DialogResult.OK)
{
      if ((OpenFileDialog1.OpenFile()) != null)
      {
           if (string.IsNullOrEmpty(OpenFileDialog1.FileName))
                return;

           pictureBox1.Image = Image.FromFile(OpenFileDialog1.FileName);
      }
}
OpenFileDialog1.Dispose();

After I made some corrections on the picturebox (e.g. drawed something), I want to save the image (to the same file, from which I've opened the image) with savefiledialog.

SaveFileDialog saveFileDialog1 = new SaveFileDialog();

saveFileDialog1.Filter = "BMP File|*.BMP";
saveFileDialog1.RestoreDirectory = true;

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
     pictureBox1.Image.Save(saveFileDialog1.FileName, ImageFormat.Bmp);
}

It gives me an error (System.Runtime.InteropServices.ExternalException) also known as GDI+ generic error. So, it's basically an error which denies me to overwrite the file I've opened recently.

Answer 1

The Image loaded by Image.FromFile() is keeping the file open.

You can Dispose() the image to release the resources, but I don't think the PictureBox would be too happy with that if it's still showing the old image.

Alternatively you could load the contents of the file in a MemoryStream and use Image.FromStream().