private void btnApprove_Click(object sender, EventArgs e)
        {
            this.Hide();
            Approve_drugs approve = new Approve_drugs();

            approve.ShowDialog();
            this.Close();
        }
        //view suugested tablet list
        private void button2_Click(object sender, EventArgs e)
        {
            Approve_drugs approve = new Approve_drugs(false);

            approve.ShowDialog();
        }