An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll Syntax error in Update statement

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C#

I have "An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll" error Additional information: "Syntax error in Update statement".

My FirmaBilgileri.cs code is here:

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace EBC
{
    public partial class FirmaBilgileri : Form
    {

        Database datab = null;

        private void FirmaBilgileri_Load(object sender, EventArgs e)
        {

            datab = new Database();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            datab.setUnvan(textBox1.Text);
            datab.setAdres(textBox2.Text);
            datab.setTelefon(textBox3.Text);
            datab.setFaks(textBox4.Text);
            datab.setEposta(textBox5.Text);
            datab.setWeb(textBox6.Text);
            datab.setVergiD(textBox7.Text);
            datab.setVergiN(textBox8.Text);
            datab.FirmaBilgileriKayitGuncelle();
        }
    }
}

And my Database.cs code is here:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Windows.Forms;
using System.Data;
using System.Collections;
using Microsoft.VisualBasic;
using System.IO;

namespace EBC
{
    public class Database
    {
        private OleDbConnection bag = new OleDbConnection();
        private OleDbCommand komut = new OleDbCommand();
        private OleDbDataReader reader = null;
        public DataTable dtable = new DataTable();

        string Unvan;
        string Adres;
        string Telefon;
        string Faks;
        string Eposta;
        string Web;
        string VergiD;
        string VergiN;
        int Kimlik = 1;

        public Database()
        {
            string baglanti = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source = BarcodeVeritabani.mdb";
            bag.ConnectionString = baglanti;

            try
            {
                bag.Open();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        public void FirmaBilgileriKayitGuncelle()
        {
            try
            {
                string sorgu = "UPDATE Firmabilgileri SET Unvan='" + this.Unvan + "', Adres='" + this.Adres + "', Telefon='" + this.Telefon + "', Faks='" + this.Faks + "', EPosta='" + this.Eposta + "', Web='" + this.Web + "', VergiD='" + this.VergiD + "', " + "VergiN='" + this.VergiN + "', WHERE Kimlik=" + this.Kimlik;

                if (bag.State == ConnectionState.Closed)
                    bag.Open();
                komut.Connection = bag;
                komut.CommandText = sorgu;
                komut.ExecuteNonQuery();
                MessageBox.Show("Kayıt Güncellendi");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        public void setUnvan(string Unvan)
        {
            this.Unvan = Unvan;
        }

        public void setAdres(string Adres)
        {
            this.Adres = Adres;
        }

        public void setTelefon(string Telefon)
        {
            this.Telefon = Telefon;
        }

        public void setFaks(string Faks)
        {
            this.Faks = Faks;
        }

        public void setEposta(string Eposta)
        {
            this.Eposta = Eposta;
        }

        public void setWeb(string Web)
        {
            this.Web = Web;
        }

        public void setVergiD(string VergiD)
        {
            this.VergiD = VergiD;
        }

        public void setVergiN(string VergiN)
        {
            this.VergiN = VergiN;
        }
    }
}

Could anyone help me?