C#从数据库读图片的问题

我以sqlserver2K中northwind数据库中categories表为例对里面的图片读取，但运行不能读出来．

protected void Button3_Click(object sender, EventArgs e)
    {
        SqlConnection connection = new SqlConnection("server=(local);database=northwind;user id=sa;pwd=");
        connection.Open();
        SqlCommand comm = new SqlCommand("select * from categories", connection);
        SqlDataReader reader = comm.ExecuteReader();
        while (reader.Read())
        {
            Response.ContentType ="image/jpeg";
            Response.BinaryWrite((byte[])reader["Picture"]);  
        }
    }

/*将PictureBox中的影像以JPEG图形格式存入MemoryStream对象中
                     */
                    MemoryStream ms = new MemoryStream();
                    
                    Bitmap bit = new Bitmap(pictureBox1.Image);
                    bit.Save(ms, ImageFormat.Jpeg);

                    byte[] Image = new byte[(int)ms.Length];

                    ms.Position = 0;
                    ms.Read(Image, 0, (int)ms.Length);
                    ms.Close();

                    /* @ 声明的变量赋值
                     * 要用Parameters集合...
                     * 第一个参数写参数名..第二个写值的数据库类型..第三个写值的数据库长度..
                     */
                    cmd.Parameters.Add("@tupian", SqlDbType.Image, Image.Length).Value = Image;
                    //cmd是SQL命令语句
                    //执行SqlCommand的SQL语句
                    cmd.ExecuteNonQuery();

                    getlist();  //刷新下拉框
                    setClear(); //清空文本框
                    MessageBox.Show("保存成功");

这是一种比较麻烦的方法....还有一种..不过没时间..哈哈..
先用这种吧...看不明白就没办法...