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copied!<p>Edit: Removed snarkyness and attitude :)</p> <p>First you need an order (hint you are going to need a class for that). Now the order needs to be attched to a user. So add a field of type User. That takes care of one order one user. (Note that a user can make more than one order)</p> <p>So now you order is missing lines. Add another member variable that is a list of line types. Now in your order you need to add methods to add, remove and query order lines.</p> <p>Edit: The question was raised what was meant by "add a field". Add a field means add a property or private member. When you are doing this you are doing the technical term of composition. Composition is commonly explained as a "has a" relationship. So an order "has a user" and "has a list of order lines"</p> <pre><code>Class User() { public string firstName { get; set; } public string lastName {get; set; } public int id { get; set;} } Class OrderLine() { } Class Order() { private List<OrderLine> orderLines; public User submitter { get; set;} public Order() { orderLines = new List<OrderLine>(); } public void AddOrderLine(OrderLine newOrderLine) { this.orderLines.Add(newOrderLine); } public IList<OrderLine> GetOrderLines() { return this.orderLines; } } </code></pre> <p>Example</p> <pre><code>User customer1 = new User(); // Initialize customer1 values... Order someOrder = new Order(); someOrder.submitter = customer1; someOrder.AddOrderLine(new OrderLine()); </code></pre> <p>EDIT: Changed Member class to User class</p>

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