private void addSociete_Click(object sender, EventArgs e)
        {
            FormAjoutSociete form = new FormAjoutSociete();

            this.Hide();
            form.Show();
        }
 private void addSociete_Click(object sender, EventArgs e)
 {
     FormAjoutSociete form = new FormAjoutSociete();
     this.Hide();
     form.Show();
 }