/// <summary>
/// Initializes a new instance of the <see cref="OrderItem"/> class.
/// </summary>
/// <param name="index">The item index</param>
/// <param name="quantity">The product quantity</param>
/// <param name="price">The product price</param>
/// <param name="product">The product being ordered</param>
public OrderItem(int index, double quantity, decimal price, Product product)
{
this.ItemIndex = index;
this.Quantity = quantity;
this.Price = price;
this.Product = product;
}
/// <summary>
/// Adds an item to the order
/// </summary>
/// <param name="quantity">The product quantity</param>
/// <param name="price">The product price</param>
/// <param name="product">The product being ordered</param>
public virtual void AddItem(double quantity, decimal price, Product product)
{
var item = new OrderItem(this.items.Count + 1, quantity, price, product);
this.items.Add(item);
}