insert image from picture box that has no physical path as it is retreived from database

SqlConnection conn = new SqlConnection(Properties.Settings.Default.SadiqueTestConnectionString);//SQL Connection
            SqlCommand cmd = new SqlCommand("SELECT Img FROM ImageTB ", conn);//Retrieving Image From DataBase
            SqlDataAdapter sqlDA = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            sqlDA.Fill(ds, "ImageTB");
            int c = ds.Tables["ImageTB"].Rows.Count;
            if (c > 0)
            {
                Byte[] byteImageData = new Byte[0];
                byteImageData = (Byte[])(ds.Tables["ImageTB"].Rows[c - 1]["Img"]);
                MemoryStream stmBLOBData = new MemoryStream(byteImageData);
                pictureBox1.Image = Image.FromStream(stmBLOBData);//Showing the Image from DataBase to Picture Box
                conn.Close(); conn.Open();
                cmd = new SqlCommand("INSERT INTO ImageTB (Img) VALUES (@Img)", conn);
                cmd.Parameters.AddWithValue("Img", byteImageData).SqlDbType = SqlDbType.Image;
                cmd.ExecuteNonQuery();// Saving the image back into Database as new Row..
            }