private void RegisterToOPDToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            this.Hide();

            OPDRegister opd = new OPDRegister();

            opd.SelectedId = selectedId;

            opd.Show();
        }
        private void ShowOpdRegister(int selectedId, bool IsUpdate)
        {
            this.Hide();
            OPDRegister opd = new OPDRegister();

            opd.IsUpdate   = IsUpdate;
            opd.SelectedId = selectedId;

            opd.Show();
        }