private void addManufactureToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Hide();
            AddMgf adm = new AddMgf();

            adm.Show();
        }
 private void addManufactureToolStripMenuItem_Click(object sender, EventArgs e)
 {
     this.Hide();
     AddMgf adm = new AddMgf();
     adm.Show();
 }