private void CalcularSubtotal()
{
foreach (DataGridViewRow row in dataGridView1.Rows)
{
row.Cells[5].Value = controladorFachada.CalcularSubtotal(Convert.ToDouble(row.Cells[2].Value), Convert.ToDouble(row.Cells[3].Value), Convert.ToDouble(row.Cells[4].Value)).ToString();
}
}
