private void btn_stock_ad_Click(object sender, EventArgs e)
        {
            form_Product objproduct = new form_Product();

            this.Hide();
            objproduct.Show();
        }
        private void btn_subcate_back_Click(object sender, EventArgs e)
        {
            form_Product Objproduct = new form_Product();

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