C#

private void button1_Click(object sender, EventArgs e)
        {
            string connectionString = "Provider=Microsoft.Jet.OleDb.4.0; data source=c:\\BookList.xls; Extended Properties=Excel 8.0;";
            string selectString = "INSERT INTO btable VALUES('12345′, 'Acme Inc', 'Acme Way', 'CA')";

            OleDbConnection con = new OleDbConnection(connectionString);
            OleDbCommand cmd = new OleDbCommand(selectString, con);

            try
            {
                con.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                con.Dispose();
            }
        }