private void BtnAddProduct_Click(object sender, EventArgs e)
        {
            AddProduct product = new AddProduct(this); //add this

            // product.btnUpdate.Hide();
            product.ShowDialog();
        }
        private void BtnAdd_Click(object sender, EventArgs e)
        {
            AddProduct product = new AddProduct(this);

            // product.btnUpdate.Enabled = false;
            product.ShowDialog();
        }