private void AddProduct_Click(object sender, EventArgs e)
        {
            AddProductForm addProduct = new AddProductForm();

            addProduct.isCreate = true;
            this.Hide();
            addProduct.Show();
        }
        private void ShowProductInfo(object sender, EventArgs e)
        {
            Label label = (Label)sender;

            AddProductForm addProduct = new AddProductForm();

            addProduct.isCreate = false;
            addProduct.ProdName = label.Text;
            this.Hide();
            addProduct.Show();
        }