Open image from picturebox in windows photo viewer C#

Question

I find this solution  
I have picture saved in database and retrieved from database in picturebox...that working fine.  
I need to show that picture in picture and fax viuwer  
Error is : The system cant find file specified     Some help?

private void button12_Click(object sender, EventArgs e)
        {
            Process photoViewer = new Process();
            photoViewer.StartInfo.FileName = @"c:\\testImage.jpg";
            photoViewer.StartInfo.Arguments = @"c:\\testImage.jpg";
            photoViewer.Start();


        }