private void BtDeconnexion_Click(object sender, EventArgs e)
{
Login_frm login_Frm = new Login_frm();
login_Frm.Show();
this.Close();
}
//Boutton deconnecter du formulaire GestionEleve
private void BtDeconnectionGestionEleve_Click(object sender, EventArgs e)
{
Login_frm Login = new Login_frm();
Login.Show();
this.Hide();
}