private void Back_AR_bt_Click(object sender, EventArgs e)
        {
            this.Hide();
            Edit_Cour f1 = new Edit_Cour();

            f1.ShowDialog();
            this.Close();
        }
        private void ArticleBt_Click(object sender, EventArgs e)
        {
            this.Hide();
            Edit_Cour art = new Edit_Cour();

            art.ShowDialog();
            this.Close();
        }