public void ShowOrderForm(UserAccount user, Guid orderId, InventoryItem inventoryItem, LoginForm loginForm)
        {
            foreach (Form form in Application.OpenForms)
            {
                if (String.Compare(form.Name, "OrderForm") == 0) { form.Show(); return; }
            }

            orderForm = new OrderForm(user, orderId, inventoryItem, loginForm);
            orderForm.Show();
        }
        public void ShowOrderForm(UserAccount user,LoginForm loginForm, Customer customer)
        {
            foreach (Form form in Application.OpenForms)
            {
                if (String.Compare(form.Name, "OrderForm") == 0) { form.Show(); return; }
            }

            orderForm = new OrderForm(user, loginForm, customer);
            orderForm.Show();
        }