private void btnGenerarVenta_Click(object sender, EventArgs e)
{
frmPventa objventa = this.Forminstanciaventa;
objventa.Show();
objventa.WindowState = FormWindowState.Maximized;
objventa.BringToFront();
}
void form_DisposedVenta(object sender, EventArgs e)
{
objformventa = null;
}
