retrieve blob picture from mysql database c#

[koanas]

I use this code to retrieve my picture and it work corectly with a simple table that contain only blob but when i'm trying to adapt it for my table user that containt (cin,nom,prenom ....,image) exception that indicate

"Paramétre non valid" (not a valid parameter)

        int bufferSize = 1000; 
        try
        {
            string SQL = "Select image from user ";

            MySqlCommand cmd = new MySqlCommand(SQL, db.Connection);
            MySqlDataAdapter da = new MySqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds, "image");
            int c = ds.Tables["image"].Rows.Count;
            db.CloseConnection();

            if (c > 0)
            {
                Byte[] byteBLOBData = new Byte[bufferSize];
                byteBLOBData = (Byte[])(ds.Tables["image"].Rows[c - 1]["image"]);
                MemoryStream stmBLOBData = new MemoryStream(byteBLOBData);

                pictureBox1.Image = Image.FromStream(stmBLOBData);
                MessageBox.Show("bien chargée");
            }

        }
        catch (Exception ex)
        {
            MessageBox.Show("Connection Error!\n" + ex.Message, "Error Message",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

[madankarmukta]

May I please know at which line it is giving an error ?