void Actualizar()
{
dataGridView1.DataSource = null;
dataGridView1.Rows.Clear();
Querys query = new Querys();
String id = Txid.Text;
List <VentaClas> listas = query.BuscarVentasId(id);
foreach (VentaClas p in listas)
{
DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[0].Clone();
row.Cells[0].Value = p.idVenta;
row.Cells[1].Value = p.fechaPedido;
row.Cells[2].Value = p.comentarios;
row.Cells[3].Value = p.totalVenta;
dataGridView1.Rows.Add(row);
}
}