private void button4_Click(object sender, EventArgs e)
        {
            this.Hide();
            Accueil al = new Accueil();

            al.ShowDialog();
            this.Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            utils.Connect();
            OleDbDataAdapter req = new OleDbDataAdapter("select COUNT(*) from users where login='******'and pass='******'", utils.cn);
            DataTable        dt  = new DataTable();

            req.Fill(dt);
            if (dt.Rows[0][0].ToString() == "1")
            {
                this.Hide();
                Accueil ac = new Accueil();
                ac.ShowDialog();
                this.Close();
            }
            else
            {
                MessageBox.Show("incorrect");
            }
        }