private void btn_admin_Click(object sender, EventArgs e)
{
this.Hide();
AddDeviceForm fm = new AddDeviceForm(null, idBorrowPerson);
fm.Show();
}
private void button2_Click(object sender, EventArgs e)
{
String codigoQr = qrtext.Text;
AddDeviceForm frm = new AddDeviceForm(codigoQr, idBorrowPerson);
frm.Show();
this.Hide();
}