程序代码：

  = "select pic from Table_1 where no=1";
            byte[] bytepic=(byte [])cmd.ExecuteScalar ();
            if (bytepic.Length  > 0)
            {
                MemoryStream stream = new MemoryStream(bytepic,true );
                stream.Write(bytepic, 0, bytepic.Length);
                pictureBox2.Image = Bitmap.FromStream(stream,true );
                stream.Close();
            }

  MemoryStream ms = new MemoryStream((byte[])reader["Cover"]);
            Image image = Image.FromStream(ms, true);