C# 二进制保存读取图片

FileStream fs = new FileStream(textBox2.Text.Trim(), FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            string str = "server=DA5A491B3F7544B;database=study;uid=sa;pwd=liyi123";
            SqlConnection con = new SqlConnection(str);
            con.Open();
            string sql = "insert into picture ([name],pic) values(@name,@pic)";
            SqlCommand cmd = new SqlCommand(sql, con);
            SqlParameter[] parm = new SqlParameter[]
                                      {
                                          new SqlParameter("@name",SqlDbType.VarChar,50),
                                          new SqlParameter("@pic",SqlDbType.Image,bytes.Length) 
                                         };
            parm[0].Value = textBox1.Text;
            parm[1].Value = bytes;
            cmd.Parameters.Add(parm[0]);
            cmd.Parameters.Add(parm[1]);
            if (cmd.ExecuteNonQuery() > 0)
                MessageBox.Show("ok");

String sql = "select * from picture where [id]=2";
            string str = "server=DA5A491B3F7544B;database=study;uid=sa;pwd=liyi123";
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlCommand cmd=new SqlCommand(sql,con);
            SqlDataReader sdr = cmd.ExecuteReader();
            if(sdr.HasRows)
            {
                sdr.Read();
                byte[] bytes = (byte[]) sdr["pic"];
                MemoryStream ms =new MemoryStream(bytes);
                Image image = Image.FromStream(ms);
                pictureBox1.Image = image;
            }
            sdr.Close();
            con.Close();

string str = "server=DA5A491B3F7544B;database=study;uid=sa;pwd=liyi123";
        SqlConnection con = new SqlConnection(str);
        con.Open();
        string sql = "select * from picture where [id]=2";
        SqlCommand cmd=new SqlCommand(sql,con);
        SqlDataReader sdr = cmd.ExecuteReader();
        if(sdr.HasRows)
        {
            sdr.Read();
            byte[] bytes = (byte[]) sdr["pic"];
            Response.ContentType = "image/jpg";
            Response.OutputStream.Write(bytes,0,bytes.Length);
            Response.End();
        }
        sdr.Close();
        con.Close();
//Response.ContentType = "text/HTML"
//Response.ContentType = "image/GIF"
//Response.ContentType = "image/JPEG"
//Response.ContentType = "text/plain"
//Response.ContentType = "image/JPEG"