private void linkback_Click(object sender, EventArgs e)
        {
            MedDirMainMenu frmMD = new MedDirMainMenu();

            frmMD.Show();
            this.Hide();
        }
        private void InventoryManagement_FormClosed(object sender, FormClosedEventArgs e)
        {
            MedDirMainMenu frmMD = new MedDirMainMenu();

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