public Order ReceiveOrder(Cart cart, string username)
{
var order = new Order{
Username = username,
OrderDate = DateTime.Now,
Status = "Received",
Total = cart.ComputeTotal(),
//CompleteDate = new DateTime(1900,1,1)
};
db.Orders.Add(order);
AddOrderDetails(order, cart);
db.SaveChanges();
cart.Clear();
return order;
}