private void productsaddButton_Click(object sender, EventArgs e)
        {
            ModifyProduct = false;
            this.Hide();
            UpdateProducts addPRoductScreen = new UpdateProducts();

            addPRoductScreen.Show();
        }
 private void productsmodifyButton_Click(object sender, EventArgs e)
 {
     if (ProductIndex >= 0)
     {
         ModifyProduct = true;
         this.Hide();
         UpdateProducts modifyProductScreen = new UpdateProducts(Inventory.CurrentProduct);
         modifyProductScreen.Show();
     }
 }