Получение данных с помощью сканера отпечатков пальцев из базы данных

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у меня есть цифровое персонифицированное устройство версии U. are. U5100.
мы используем в c# с sdk, он генерирует уникальный код каждый отпечаток большого пальца.
я сохраняю уникальный код в sql server, но как извлечь его с помощью этого кода.
потому что его дают каждый раз новым уникальным кодом.

private void OnCaptured(CaptureResult captureResult)
        {
            try
            {
                // Check capture quality and throw an error if bad.
                if (!_sender.CheckCaptureResult(captureResult)) return;

                foreach (Fid.Fiv fiv in captureResult.Data.Views)
                {
                    SendMessage3(Action3.SendBitmap3, _sender.CreateBitmap(fiv.RawImage, fiv.Width, fiv.Height));
                    a = fiv.Bytes;
                    String aas =Convert.ToString(fiv.Bytes);

                }
                DataResult<fmd> resultConversion = FeatureExtraction.CreateFmdFromFid(captureResult.Data, Constants.Formats.Fmd.ANSI);
                //   Convert.ToString(resultConversion.Data)
                DataTable dt = new DataTable();


                dt = getdata(a);
                if (dt.Rows.Count &gt; 0)
                {
                    fingervalue = Fmd.SerializeXml(resultConversion.Data);

                    //====================================================================

                    if (resultConversion.ResultCode != Constants.ResultCode.DP_SUCCESS)
                    {
                        _sender.Reset = true;
                        throw new Exception(resultConversion.ResultCode.ToString());
                    }


                    // =======1 End=========//


                    firstFinger = Fmd.DeserializeXml(Convert.ToString(dt.Rows[1]["Finger_Value"]));


                    if (count == 0)
                    {
                        SendMessage(Action.SendMessage, "Enrollment 3.");

                        thirdFinger = resultConversion.Data;
                        CompareResult compareResult = Comparison.Compare(firstFinger, 0, thirdFinger, 0);
                        if (compareResult.ResultCode != Constants.ResultCode.DP_SUCCESS)
                        {
                            _sender.Reset = true;
                            throw new Exception(compareResult.ResultCode.ToString());
                        }

                        String m1 = " (fingerprints matched)";
                        String m2 = " (fingerprints did not match)";
                        SendMessage(Action.SendMessage, "Comparison resulted in a dissimilarity score of " +
                        compareResult.Score.ToString() + (compareResult.Score &lt; (PROBABILITY_ONE / 100000) ? m1 : m2));
                        if (compareResult.Score &lt; (PROBABILITY_ONE / 100000))
                        {

                            //=======3 start=========//
                            try
                            {
                                // Check capture quality and throw an error if bad.
                                if (!_sender.CheckCaptureResult(captureResult)) return;

                                // Create bitmap
                                foreach (Fid.Fiv fiv in captureResult.Data.Views)
                                {
                                    SendMessage3(Action3.SendBitmap3, _sender.CreateBitmap(fiv.RawImage, fiv.Width, fiv.Height));
                                    //fingervalue = Fmd.SerializeXml(resultConversion.Data); ;
                                    //widht = fiv.Width;
                                    //height = fiv.Height;
                                    //System.Text.Encoding.UTF8.GetString(byteArray);

                                }
                            }
                            catch (Exception ex)
                            {
                                // Send error message, then close form
                                SendMessage(Action.SendMessage, "Error:  " + ex.Message);
                            }
                            //========3 End========//
                        }
                        else
                        {
                            // pictureBox2.Image =;
                            pictureBox2.Image = null;
                            //pictureBox2.Refresh();
                        }
                        SendMessage(Action.SendMessage, "Place a finger on the reader.");
                        count = 0;
                    }
                    //====================================================================
                }
                else
                {
                    if (resultConversion.ResultCode != Constants.ResultCode.DP_SUCCESS)
                    {
                        _sender.Reset = true;
                        throw new Exception(resultConversion.ResultCode.ToString());
                    }

                    if (count == 0)
                    {
                        SendMessage(Action.SendMessage, "Enrollment 1.");
                        //  =======1 start=========//
                        try
                        {
                            // Check capture quality and throw an error if bad.
                            if (!_sender.CheckCaptureResult(captureResult)) return;

                            // Create bitmap
                            foreach (Fid.Fiv fiv in captureResult.Data.Views)
                            {
                                SendMessage1(Action1.SendBitmap, _sender.CreateBitmap(fiv.RawImage, fiv.Width, fiv.Height));
                                fingervalue = Fmd.SerializeXml(resultConversion.Data);
                                widht = fiv.Width;
                                height = fiv.Height;
                                a = fiv.Bytes;
                                savedata();
                            }

                        }
                        catch (Exception ex)
                        {
                            // Send error message, then close form
                            SendMessage(Action.SendMessage, "Error:  " + ex.Message);
                        }
                        // =======1 End=========//

                        firstFinger = resultConversion.Data;
                        //Byte a;
                        //int b, c;
                        // String abc;
                        //firstFinger = (Fmd)abc;

                        count += 1;
                        SendMessage(Action.SendMessage, "Now place the same finger on the reader.");
                    }
                    else if (count == 1)
                    {
                        SendMessage(Action.SendMessage, "Enrollment 2.");

                        //=======2 Start=========//
                        try
                        {
                            // Check capture quality and throw an error if bad.
                            if (!_sender.CheckCaptureResult(captureResult)) return;

                            // Create bitmap
                            foreach (Fid.Fiv fiv in captureResult.Data.Views)
                            {
                                SendMessage2(Action2.SendBitmap2, _sender.CreateBitmap(fiv.RawImage, fiv.Width, fiv.Height));
                                fingervalue = Fmd.SerializeXml(resultConversion.Data); ;
                                widht = fiv.Width;
                                height = fiv.Height;
                                a = fiv.Bytes;
                                savedata();
                            }
                        }
                        catch (Exception ex)
                        {
                            // Send error message, then close form
                            SendMessage(Action.SendMessage, "Error:  " + ex.Message);
                        }
                        //======2 End==========//
                        secondFinger = resultConversion.Data;
                        count += 1;
                        SendMessage(Action.SendMessage, "Now place the same finger on the reader.");
                    }
                    else if (count == 2)
                    {
                        SendMessage(Action.SendMessage, "Enrollment 3.");

                        thirdFinger = resultConversion.Data;
                        CompareResult compareResult = Comparison.Compare(secondFinger, 0, thirdFinger, 0);
                        if (compareResult.ResultCode != Constants.ResultCode.DP_SUCCESS)
                        {
                            _sender.Reset = true;
                            throw new Exception(compareResult.ResultCode.ToString());
                        }

                        String m1 = " (fingerprints matched)";
                        String m2 = " (fingerprints did not match)";
                        SendMessage(Action.SendMessage, "Comparison resulted in a dissimilarity score of " +
                        compareResult.Score.ToString() + (compareResult.Score &lt; (PROBABILITY_ONE / 100000) ? m1 : m2));
                        if (compareResult.Score &lt; (PROBABILITY_ONE / 100000))
                        {

                            //=======3 start=========//
                            try
                            {
                                // Check capture quality and throw an error if bad.
                                if (!_sender.CheckCaptureResult(captureResult)) return;

                                // Create bitmap
                                foreach (Fid.Fiv fiv in captureResult.Data.Views)
                                {
                                    SendMessage3(Action3.SendBitmap3, _sender.CreateBitmap(fiv.RawImage, fiv.Width, fiv.Height));
                                    fingervalue = Fmd.SerializeXml(resultConversion.Data); ;
                                    widht = fiv.Width;
                                    height = fiv.Height;
                                    a = fiv.Bytes;
                                    savedata();
                                    //System.Text.Encoding.UTF8.GetString(byteArray);
                                }
                            }
                            catch (Exception ex)
                            {
                                // Send error message, then close form
                                SendMessage(Action.SendMessage, "Error:  " + ex.Message);
                            }
                            //========3 End========//
                        }
                        else
                        {
                            // pictureBox2.Image =;
                            pictureBox2.Image = null;
                            //pictureBox2.Refresh();
                        }
                        SendMessage(Action.SendMessage, "Place a finger on the reader.");
                        count = 0;
                    }
                }
            }
            catch (Exception ex)
            {
                // Send error message, then close form
                SendMessage(Action.SendMessage, "Error:  " + ex.Message);
            }

        }</fmd>

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