private void FormMain_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control && e.KeyCode == Keys.F)
            {
                FeeSubmission feeSubmission = new FeeSubmission();
                feeSubmission.ShowDialog();
            }

            if (e.Control && e.KeyCode == Keys.S)
            {
                SearchStudent search = new SearchStudent();
                search.ShowDialog();
            }

            if (e.Control && e.KeyCode == Keys.A)
            {
                AddStudent search = new AddStudent();
                search.ShowDialog();
            }

            if (e.Control && e.KeyCode == Keys.V)
            {
                FeeVoucher vouc = new FeeVoucher();
                vouc.ShowDialog();
            }
        }
        private void paneladdstd_Click(object sender, EventArgs e)
        {
            AddStudent ad = new AddStudent();

            ad.ShowDialog();
        }