SQL DataReader İle Birden Fazla Kayıt Değişkeni Oluşturma ve Zamana Bağlı Güncelleme

C# Tarafı
string cs1 = ConfigurationManager.ConnectionStrings["musteriCS"].ConnectionString;
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        string saat = DateTime.Now.ToLongTimeString();

        Label5.Text = saat;

        if (saat == "11:00:10")
        {
            SqlConnection baglanti1 = new SqlConnection(cs1);
            SqlCommand cmd1 = new SqlCommand("TRUNCATE TABLE musteri_sabit", baglanti1);
            baglanti1.Open();
            cmd1.ExecuteNonQuery();
            baglanti1.Close();



            SqlConnection baglanti2 = new SqlConnection(cs1);

            SqlCommand cmdcek = new SqlCommand("SELECT TOP 10 DEFINITION_ , TCNO_VERGINO FROM DELL_MUSTERI", baglanti2);
            baglanti2.Open();

            SqlDataReader dr = cmdcek.ExecuteReader();

            while (dr.Read())
            {
                string def_degiskeni = dr["DEFINITION_"].ToString();
                string tcvergi_degiskeni = dr["TCNO_VERGINO"].ToString();


                SqlConnection baglantiekle = new SqlConnection(cs1);
                SqlCommand eklecmd = new SqlCommand("insert into musteri_sabit (musteriadi,tcno_vergino) values('" + def_degiskeni + "','" + tcvergi_degiskeni + "')", baglantiekle);
                baglantiekle.Open();
                eklecmd.ExecuteNonQuery();
                baglantiekle.Close();


            }

            dr.Close();
            baglanti2.Close();

            Response.Redirect("sqldeneme.aspx");
        }


ASP Tarafı
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:musteriCS %>" SelectCommand="SELECT * FROM [musteri_sabit]"></asp:SqlDataSource>
        <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:musteriCS %>" SelectCommand="SELECT TOP 10 * FROM [DELL_MUSTERI]"></asp:SqlDataSource>
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
         <asp:Timer ID="Timer1" Interval="1000" runat="server" OnTick="Timer1_Tick"></asp:Timer>
  
 
        <asp:UpdatePanel runat="server" id="TimedPanel" updatemode="Conditional">
             <Triggers>
                 <asp:AsyncPostBackTrigger controlid="Timer1" eventname="Tick" />
              </Triggers>
 
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            </ContentTemplate>
  </asp:UpdatePanel>