c# ผมอยากเก็บ byte[] ในmy sql พร้อม select ดูอะครับ ควรแก้ไข้โคร๊สยังไงครับช่วยที ใช้ type ประเภทไหนคับ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Simple_Code
{
    public partial class UserControl1 : UserControl
    {

        DataSet dsl_select;
        public string[] Value = new string[6];
        bool isConnected;
        int FMatchType;
        int fpcHandle;
        int time = 0;
        int i = 3;
        bool VerifyCheck = false; 

        object VerTemplate;
        object RegTemplate;
        string RegTemplateStr;
        string izkfpver;

        string test;
        public event PropertyChangedEventHandler property;
        public delegate void PropertyChangedEventHandler(string s);

        public UserControl1()
        {
            InitializeComponent();
        }

        public string[] Connection()
        {
            
            axZKFPEngX1.FPEngineVersion = "9";
            izkfpver = axZKFPEngX1.FPEngineVersion;
            axZKFPEngX1.SensorIndex = 0;
             if (axZKFPEngX1.InitEngine() == 0)
            {

                 try
                {
                    Value[0] = "Connect";
                    Value[1] = "Finger Serial Number :" + axZKFPEngX1.SensorSN.ToString();
                    Value[2] = "Finger Count :" + axZKFPEngX1.SensorCount.ToString();
                    Value[3] = "Finger Index :" + axZKFPEngX1.SensorIndex.ToString();
                    Value[4] = "ImageWidth Record :" + axZKFPEngX1.ImageWidth.ToString();
                    Value[5] = "ImageHeight Record :" + axZKFPEngX1.ImageHeight.ToString();
                    isConnected = true;
                    fpcHandle = axZKFPEngX1.CreateFPCacheDB();
                 }
                 catch
                {
                    axZKFPEngX1.EndEngine();
                    Value[0] = "Disconnect";
                    Value[1] = "";
                    Value[2] = "";
                    Value[3] = "";
                    Value[4] = "";
                    Value[5] = "";
                    isConnected = false;
                }
            }
             return Value;
        }

        public void Disconnect()
        {
            axZKFPEngX1.EndEngine();
            //GlobalValue.FingerValue = null;
            isConnected = false;
 
        }

        public void BeginEnroll()
        {
            if (isConnected == true)
            {
                if (axZKFPEngX1.IsRegister)
                {
                    axZKFPEngX1.CancelEnroll();
                }
                axZKFPEngX1.EnrollCount = 3;
                axZKFPEngX1.BeginEnroll();
                property("Begin Enroll");  
            }
            else
            {
                property("No Sensor Connected");
            }
        }

        private void axZKFPEngX1_OnFingerTouching(object sender, EventArgs e)
        {
            property("FingerTouching");
        }

        private void axZKFPEngX1_OnFingerLeaving(object sender, EventArgs e)
        {
            property("OnFingerLeaving");
        }

        private void axZKFPEngX1_OnEnroll(object sender, AxZKFPEngXControl.IZKFPEngXEvents_OnEnrollEvent e)
        {
            byte[] tmp = new byte[0];
            if (e.actionResult)
            {
                //MessageBox.Show(e.aTemplate.ToString());
                tmp = (byte[])e.aTemplate;
                //GlobalValue.FingerValue = tmp;
                
            }
            else
            {
                tmp = null;
                //GlobalValue.FingerValue = tmp;
            }

            System.Data.SqlClient.SqlConnection con;
            con = new System.Data.SqlClient.SqlConnection();
            con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True";
     ****       string sql = "UPDATE Finger_Table SET Finger_Value=@Finger_Value WHERE User_ID= "+GlobalValue.Index+"";
            SqlCommand cmd = new SqlCommand(sql, con);
            con.Open();
            SqlParameter parafinger = new SqlParameter();
            parafinger.ParameterName = "@Finger_Value";
            parafinger.Value = tmp;
           
            cmd.Parameters.Add(parafinger);
            cmd.ExecuteNonQuery();
            

            property("OnEnroll");
        }

        public void BeginVerify()
        {
            if (!isConnected)
            {
                MessageBox.Show("Please Initial sensor first!", "notice");
                return;
            }
            if (axZKFPEngX1.IsRegister)
            {
                axZKFPEngX1.CancelEnroll();
                
            }
            VerifyCheck = true;
            axZKFPEngX1.BeginCapture();
            property("OnVerify");
        }

        private void axZKFPEngX1_OnCapture(object sender, AxZKFPEngXControl.IZKFPEngXEvents_OnCaptureEvent e)
        {

            //string tmpbyte;
            VerTemplate = e.aTemplate;
            byte[] vartemplat = (byte[])VerTemplate;
            //int score = 9;
            //int processedFPNumber = 1;
            //int ID;
            //string tempstr;
            string Template = axZKFPEngX1.GetTemplateAsString();
            if (e.actionResult && VerifyCheck == true)
            {
                VerifyCheck = false;
                bool check = false;
                string temp;
                axZKFPEngX1.OneToOneThreshold = 40;
                axZKFPEngX1.Threshold = 40;
                temp = axZKFPEngX1.GetTemplateAsString();

                System.Data.SqlClient.SqlConnection con;
                con = new System.Data.SqlClient.SqlConnection();
                dsl_select = new DataSet();
                //try
                 //{
                     con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True";
          ****           string sql = "SELECT Finger_Value FROM Finger_Table WHERE User_ID = '"+GlobalValue.Index+"'";
                     SqlDataAdapter da = new SqlDataAdapter(sql, con);

                     con.Open();

                     da.Fill(dsl_select, "SELECT");
                     DataRow dRow = dsl_select.Tables["SELECT"].Rows[0];

                     //tmpbyte = dRow.ItemArray.GetValue(0);
                     object fingerTemp = dRow.ItemArray.GetValue(0);
                     if (axZKFPEngX1.VerFinger(ref fingerTemp, VerTemplate, false, ref check) == true)
                     {
                         MessageBox.Show("Sucess!!");
                     }
                     else
                     {
                         MessageBox.Show("Fail!!");
                     }

                //}
                //catch
                 //{ 
                
                 //}
            
            
            
            
            }
        
        
        }



    }
}