Ensayo marte

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;namespace apEjemAccess
{
public partial class Form1 : Form
{
private accesoDatos ad = new accesoDatos();
private DataSet ds = new DataSet();
private int conteo =0;
private string sqlCad;

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{sqlCad = "SELECT * FROM LIBRO";
ds = ad.consultarDS(sqlCad);
dataGridView1.DataSource = ds.Tables[0];
//id =int.Parse(ds.Tables[0].Rows[0].ItemArray.GetValue(2).ToString());
//sqlCad = "SELECT * FROM AUTOR WHERE ID =" + id;
//ds = ad.consultarDS(sqlCad);
//comodin = txtAutor.Text;
//NombAutor =ds.Tables[0].Rows[0].ItemArray.GetValue(1).ToString();
//ApAutor = ds.Tables[0].Rows[0].ItemArray.GetValue(2).ToString();
//txtAutor.Text = comodin + " " + NombAutor + " " +ApAutor;
//sqlCad = "SELECT * FROM LIBRO";
//ds = ad.consultarDS(sqlCad);

}

private void button1_Click(object sender, EventArgs e) // Botón Abrir/Buscar{
if (button1.Text == "Abrir")
{
txtId.Enabled = true;
txtId.Focus();
button1.Text = "Buscar";
}else
{
sqlCad = "SELECT * FROM LIBRO WHERE ID = " + txtId.Text.Trim();
ds = ad.consultarDS(sqlCad);
if (ds.Tables[0].Rows.Count <1)
{
MessageBox.Show("Registro no encontrado", "Error");
}
else
{
txtNombre.Text =...