how to show image in picture box from access database

i am using this code:
save is okk
but
when i tried to retrieve the image t shows error
..........'Parameter not Valid';

public static byte[] ImageToByte(Image img)
        {
            ImageConverter converter = new ImageConverter();
            return (byte[])converter.ConvertTo(img, typeof(byte[]));
        }
        public static Image ImageFromByte(byte[] image)
        {
            ImageConverter ic = new ImageConverter();
            Image img = (Image)ic.ConvertFrom(image);
            return img;
        }
///////////////////Save Code
byte[] img = ImageToByte(pictureBox1.Image);
           
            int count = img.Length;
            data.insert("insert into itemimage(itemname,photo)values('" + textBox1.Text + "','" +img+ "')");
            MessageBox.Show("Saved");

/////////Retrieve image in pic box
private void button3_Click(object sender, EventArgs e)
        {
            DataSet ds=   data.display("select photo from itemimage where itemname='"+textBox1.Text+"'");
            byte[]b= (byte[])ds.Tables[0].Rows[0]["photo"];
            Image photo=ImageFromByte(b);
            pictureBox1.Image = photo;
            // pictureBox1.Image = ByteArrayToImage((Byte[])ds.Tables[0].Rows[0]["photo"]);
        }