private void button1_Click(object sender, EventArgs e)
        {
            this.Hide();
            AdminMDI ALMDI = new AdminMDI();

            ALMDI.Show();
        }
        private void label3_Click(object sender, EventArgs e)
        {
            AdminMDI AGAIN = new AdminMDI();

            AGAIN.Show();
            this.Hide();
        }