private void btnSync_Click(object sender, EventArgs e)
        {
            Close();
            Part_add new_Form = new Part_add();

            new_Form.Show();
            BringToFront();
        }
        private void btnAdd_Part_Click(object sender, EventArgs e)
        {
            Part_add new_form = new Part_add();

            new_form.ShowDialog();
        }