public void liberarButaca(string but)
{
foreach (DataGridViewRow row in dgButacas.Rows)
{
if (row.Cells["N° Butaca"].Value.ToString() == but)
{
row.Cells["N° Butaca"].Style.BackColor = Color.White;
row.Cells["Tipo"].Style.BackColor = Color.White;
}
}
this.cantidadButacas += 1;
}