C# - xml import v bazo

 protected void uvoziPodatkeXML(string backup, int tabela, string destinacijaTabela)
        {
            DataSet reportData = new DataSet();

            FileStream filestream = File.OpenRead(lblPotIzvozi.Text + txtIme.Text + backup);
            BufferedStream buffered = new BufferedStream(filestream);
            reportData.ReadXml(buffered);

            //reportData.ReadXml(lblPotIzvozi.Text + txtIme.Text + backup);



            SqlConnection povezava = new SqlConnection(Convert.ToString(Session["cs"]));
            SqlBulkCopy sbc = new SqlBulkCopy(Convert.ToString(Session["cs"]), SqlBulkCopyOptions.KeepIdentity);
            povezava.Open();
            sbc.DestinationTableName = destinacijaTabela;
            sbc.WriteToServer(reportData.Tables[tabela]);
            sbc.Close();

            povezava.Close();
        }

private void button10_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.InitialDirectory = "D:\\";
            openFileDialog1.Filter = "xml files (*.xml)|*.xml|All files (*.*)|*.*";
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                XmlTextReader reader = new XmlTextReader(openFileDialog1.FileName);
                System.Xml.XmlDocument datoteka = new System.Xml.XmlDocument();
                System.Xml.XmlDocument CompSpecs = new System.Xml.XmlDocument();// Set up the XmlDocument (CompSpecs) //

                CompSpecs.Load(reader); //Load the data from the file into the XmlDocument (CompSpecs) //
                dataGridView1.Rows.Add();

                System.Xml.XmlNodeList NodeList = CompSpecs.GetElementsByTagName("book");
                dataGridView1.Rows.Add(NodeList.Count - 1);

                for (int i = 1; i <= NodeList.Count; i++)
                {
                    //preberi kar pripada nodu (title)
                    System.Xml.XmlNodeList NodeList0 = CompSpecs.GetElementsByTagName("title");
                    dataGridView1.Rows[i - 1].Cells[0].Value = NodeList0[i - 1].ChildNodes[0].InnerText;
               }
            }
        }

string cnString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + path + "';";

                string dbCommand = "SELECT Column1, Column2, Column3 FROM Table1;";
                OleDbDataAdapter adapter = new OleDbDataAdapter(dbCommand, cnString);
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                DataTable dt = ds.Tables[0];