Converting to byte from picturebox

Guys, I'm trying to save the image that was entered into my picturebox via open file dialog, but I get the below exception thrown?

'Object reference not set to an instance of an object.'

Below is my save code to save it back to the DB but clearly something is wrong or I'm not converting to byte array correctly?

            MemoryStream stream = new MemoryStream();
            logoPictureBox.Image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            byte[] pic = stream.ToArray();

            this.Validate();
            this.companyBindingSource.EndEdit();
            this.tableAdapterManager.UpdateAll(this.companyDetailsDataSet);

I found the solution to this one guys with a bit of playing on the below, but would appreciate any comments if there's a better way of my method could cause issues?

            string imagename;
            try
            {

                FileDialog fldlg = new OpenFileDialog();

                fldlg.Filter = "Image File (*.jpg;*.bmp;*.gif;*.png)|*.jpg;*.bmp;*.gif;*.png";
                if (fldlg.ShowDialog() == DialogResult.OK)
                {

                    imagename = fldlg.FileName;

                    Bitmap newimg = new Bitmap(imagename);

                    picturePictureBox.SizeMode = PictureBoxSizeMode.StretchImage;

                    picturePictureBox.Image = (Image)newimg;

                }

                fldlg = null;

            }