How to import data from listview in excel?

try
            {

                string filename = "";
                SaveFileDialog op = new SaveFileDialog();
                op.Filter = "Exel|*.xls";
                if (op.ShowDialog() == DialogResult.OK)
                {
                    filename = op.FileName;
                    StreamWriter wr = new StreamWriter(filename);
                    for (int i = 0; i < DetailsView.Columns.Count; i++)
                    {

                        wr.Write(DetailsView.Columns[i].Text);
                        wr.Write("\t");

                    }
                    wr.Write("\n");

                    for (int r = 0; r < DetailsView.Items.Count - 1; r++)
                    {
                        for (int c = 0; c < DetailsView.Columns.Count; c++)
                        {
                            wr.Write(DetailsView.Items[r].SubItems[c].Text.ToString());
                            wr.Write("\t");
                        }
                        wr.Write("\n");
                    }



                    wr.Close();
                }
                System.Diagnostics.Process.Start(filename);




            }
            catch (SystemException io)
            {
                MessageBox.Show(io.Message);
            }