WCF order representation

gistfile1.cs

[DataContract]
public class Order
{
    private String id;
    private String productId;
    private String quantity;

    [DataMember]
    public String Id
    {
        get { return this.id; }
        set { this.id = value; }
    }

    [DataMember]
    public String ProductId
    {
        get { return this.productId; }
        set { this.productId = value; }
    }

    [DataMember]
    public String Quantity
    {
        get { return this.quantity; }
        set { this.quantity = value; }
    }

}