EF mapping

q.cs

public class Order 
{
 public int OrderId {get; private set;}
 public List<Orderlines> Orderlines {get; private set;}
}

public class Orderline
{
  public string Item {get; private set;}
  public int Quantity {get;private set;}
}

// to table
// OrderId     int      : 503
// OrderLines  varchar  : {{ Item: 'book', Quantity : 2 }, { Item: 'toy', Quantity : 6 }}
// or

// OrderId     int      : 503
// OrderLines  xml  : <Orderlines><Line><Item>book</item><Quantity>2</Quantity></Line><Line><Item>'toy'</Item><Quantity>6</Quantity></Line></Orderlines>