Veritabanında Olan resim Kayıtlarının Klasör İçersindeki Varlığını Kontrol etmek

C# Tarafı metod İle 
public void resimKontrol()
    {
        SqlConnection baglanti1 = new SqlConnection(cs1);
        SqlCommand cmd1 = new SqlCommand("TRUNCATE TABLE resim_kontrol", baglanti1);
        baglanti1.Open();
        cmd1.ExecuteNonQuery();
        baglanti1.Close();

        //System.IO.File.Move(@"C:\Users\Lenovo\Desktop\deneme\" + kod_degiskeni + ".jpg", @"C:\Users\Lenovo\Desktop\deneme\" + kod_degiskeni + "" + -1 + ".jpg");
        SqlConnection baglanti = new SqlConnection(cs1);

        SqlCommand cmdcek = new SqlCommand("SELECT kodref FROM resim", baglanti);
        baglanti.Open();

        SqlDataReader dr = cmdcek.ExecuteReader();

        while (dr.Read())
        {
            string kod_degiskeni = dr["kodref"].ToString();
            string resimkontrol_degiskeni = @"C:\Users\Lenovo\Documents\Visual Studio 2013\WebSites\CaglayanGrup\images\urunler\" + kod_degiskeni + ".jpg";

            if (File.Exists(resimkontrol_degiskeni))
            {
                //ListBox1.Items.Add(kod_degiskeni+"  var");
                //Label1.Text = ListBox1.Items.Count.ToString();
            }
            else
            {
                //ListBox2.Items.Add(kod_degiskeni+"  yok");
                //Label2.Text = ListBox2.Items.Count.ToString();
                SqlConnection baglantiekle = new SqlConnection(cs1);
                SqlCommand eklecmd = new SqlCommand("insert into resim_kontrol (kodref,kontrol) values('" + kod_degiskeni + "','0')", baglantiekle);
                baglantiekle.Open();
                eklecmd.ExecuteNonQuery();
                baglantiekle.Close();
            }


        }


        dr.Close();
        baglanti.Close();


        GridView2.AllowPaging = false;
        lblresimkontrol.Text = GridView2.Rows.Count.ToString()+ " Adet Resim Eksik Durumdadır!";
        lblresimkontrol.ForeColor = System.Drawing.Color.Red;
        lblresimkontrol.Font.Bold = true;
        GridView2.AllowPaging = true;

        GridView2.DataBind();
    }

Form.cs Tarafı
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" CellPadding="4" DataSourceID="rkSqlDataSource1" ForeColor="#333333" GridLines="Horizontal" DataKeyNames="id">
            <AlternatingRowStyle BackColor="White" />
            <Columns>
                <asp:BoundField DataField="id" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="id" >
                <HeaderStyle CssClass="tacenter" />
                <ItemStyle CssClass="tacenter" Width="50px" />
                </asp:BoundField>
                <asp:BoundField DataField="kodref" HeaderText="KOD REFERANS" SortExpression="kodref" >
                <HeaderStyle CssClass="tacenter" />
                <ItemStyle CssClass="tacenter" Width="150px" />
                </asp:BoundField>
                <asp:CheckBoxField DataField="kontrol" HeaderText="KONTROL" SortExpression="kontrol" >
                <ItemStyle CssClass="tacenter" Width="50px" />
                </asp:CheckBoxField>
            </Columns>
            <EditRowStyle BackColor="#7C6F57" />
            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#E3EAEB" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#F8FAFA" />
            <SortedAscendingHeaderStyle BackColor="#246B61" />
            <SortedDescendingCellStyle BackColor="#D4DFE1" />
            <SortedDescendingHeaderStyle BackColor="#15524A" />
        </asp:GridView>
        <asp:Label ID="lblresimkontrol" runat="server" Text="Label"></asp:Label>
        <asp:SqlDataSource ID="rkSqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:urunCS %>" SelectCommand="SELECT * FROM [resim_kontrol]" ></asp:SqlDataSource>
        <br />