我想在C# windows窗体中通过选择dataGridView中的一行来删除一行，但是我想从Excel表格中删除这条记录，在我写的代码中，只删除了dataGridView中选择的行，请帮助我解决这个问题。
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我用下面的代码删除DataGridView中选定的行。

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    using System.Data.OleDb;
    
    namespace Ünistop
    {
        public partial class SoforİlanlarıGoruntuleForm : Form
        {
            public SoforİlanlarıGoruntuleForm()
            {
                InitializeComponent();
                this.StartPosition = FormStartPosition.CenterScreen;
            }
    
            public static DataTable ExcelTabloDondur(string yol)
            {
                DataTable tablo = new DataTable();
                string sorgu = "select*from[Sayfa1$]";
                OleDbConnection baglanti = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + yol + ";Extended Properties=Excel 8.0;");
                try
                {
                    baglanti.Open();
                    OleDbCommand cekilenveri = new OleDbCommand(sorgu, baglanti);
                    cekilenveri.CommandTimeout = 250;
                    OleDbDataReader oku = cekilenveri.ExecuteReader(CommandBehavior.Default);
                    tablo.Load(oku);
                    oku.Close();
                    baglanti.Close();
                    cekilenveri.Dispose();
                    oku.Dispose();
                    baglanti.Dispose();
                }
                catch
                {
                    baglanti.Close();
                    baglanti.Dispose();
                }
                return tablo;
            }
    
            private void SoforİlanlarıGoruntuleForm_Load(object sender, EventArgs e)
            {
                DataTable tablo = İlanAraFormu.ExcelTabloDondur("ilanlar.xls");
                dataGridView1.DataSource = tablo;
            }
    
            private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
            {
                int secilen = dataGridView1.SelectedCells[0].RowIndex;
                plakaNo_txt.Text = dataGridView1.Rows[secilen].Cells[0].Value.ToString();
                aracKapasitesi_txt.Text = dataGridView1.Rows[secilen].Cells[1].Value.ToString();
                sehir_txt.Text = dataGridView1.Rows[secilen].Cells[2].Value.ToString();
                durak_txt.Text = dataGridView1.Rows[secilen].Cells[3].Value.ToString();
            }
    
            private void sil_btn_Click(object sender, EventArgs e)
            {
                string yol = "ilanlar.xls";
                OleDbConnection baglanti = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source =" + yol + ";Extended Properties=Excel 8.0;");
                baglanti.Open();
    
                if (DialogResult.Yes == MessageBox.Show("İlanınızı silmek istediğinize emin misiniz?", "İlan Silme", MessageBoxButtons.YesNo))
                {
                    foreach (DataGridViewRow secilen in this.dataGridView1.SelectedRows)
                    {
                        dataGridView1.Rows.RemoveAt(secilen.Index);
                        MessageBox.Show("Verdiğiniz ilan silinmiştir.", "İlan Silme", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    }
    
                    plakaNo_txt.Clear();
                    aracKapasitesi_txt.Clear();
                    sehir_txt.Clear();
                    durak_txt.Clear();
                }
            }
        }
    }