public void OnComplete(object Capture, string ReaderSerialNumber, DPFP.Sample Sample)
        {

        Bitmap bitmap;
        bitmap = ConvertSampleToBitmap(Sample);
        Bitmap img = new Bitmap(bitmap, Picture.Size);
        this.Invoke(new Function(delegate ()
        {
            Picture.Image = img;   // fit the image into the picture box
                                   //string ping;
                using (MemoryStream m = new MemoryStream())
                {
                    img.Save(m, ImageFormat.Bmp);
                    m.Position = 0;
                    DPFP.Template Template = new DPFP.Template(m);
                    MemoryStream fingerprintData = new MemoryStream();
                    Template.Serialize(fingerprintData);
                    fingerprintData.Position = 0;
                    BinaryReader br = new BinaryReader(fingerprintData);
                    Byte[] bytes = br.ReadBytes((Int32)fingerprintData.Length);
                    string ping = BitConverter.ToString(bytes);

                    MySqlConnectionStringBuilder connBuilder = new MySqlConnectionStringBuilder();

                    connBuilder.Add("Server", "localhost");
                    connBuilder.Add("Port", "3306");
                    connBuilder.Add("Database", "db_fingerprint");
                    connBuilder.Add("Username", "root");
                    connBuilder.Add("Password", "");

                    MySqlConnection conn = new MySqlConnection(connBuilder.ConnectionString);

                    MySqlCommand cmd = conn.CreateCommand();

                    cmd.CommandText = "INSERT INTO tbl_finger VALUES(@finger_id,  @finger_tag, @stud_id)";
                    cmd.Parameters.AddWithValue("finger_id", "");
                    cmd.Parameters.AddWithValue("stud_id", txtstud_num.Text);
                    cmd.Parameters.AddWithValue("finger_tag", ping);

                    conn.Open();
                    int a = cmd.ExecuteNonQuery();
                    if (a > 0)
                    {
                        MessageBox.Show("Fingerprint Registered.");
                        cmd.CommandText = "UPDATE tbl_students SET is_registered = 1 WHERE stud_id = '" + txtstud_num.Text + "';";
                        cmd.ExecuteNonQuery();
                    }
                    else
                    {
                        MessageBox.Show("No Fingerprint Registered.");
                    }
                    conn.Close();
                }
        }));
    }