I'm trying to adopt Fluent NHibernate with my project, currently I can get data from database, when I'm at application server, data is include its PK but when I return this data (as List) to client all of its PK is loose.

How can I fixed this problem?

Update

My POCO class is below: PKs are CountryCd and CityCd

```
public class coCity
{
    public virtual string CountryCd { get; private set; }
    public virtual string CityCd { get; private set; }
    public virtual string CityNameTH { get; set; }
    public virtual string CityNameEN { get; set; }
    public virtual int DeliveryLeadTime { get; set; }
    public virtual string CreateBy { get; set; }
    public virtual DateTime CreateDate { get; set; }
    public virtual string UpdateBy { get; set; }
    public virtual DateTime UpdateDate { get; set; }

    public override bool Equals(object obj)
    {
        return this.GetHashCode().Equals(obj.GetHashCode());
    }

    public override int GetHashCode()
    {
        return (this.CountryCd + this.CityCd).GetHashCode();
    }
}

```

Mapping class:

```
public class coCityMap : ClassMap<coCity>
{
    public coCityMap()
    {
        Table("coCity"); // this is optional

        CompositeId()
            .KeyProperty(x => x.CountryCd)
            .KeyProperty(x => x.CityCd);
        Map(x => x.CityNameTH);
        Map(x => x.CityNameEN);
        Map(x => x.DeliveryLeadTime);
        Map(x => x.CreateBy);
        Map(x => x.CreateDate);
        Map(x => x.UpdateBy);
        Map(x => x.UpdateDate);
    }
}

```

Source code to get data at application server

```
public List<coCity> GetTest()
{
    List<coCity> result = new List<coCity>();

    var sessionFactory = CreateSessionFactory();

    using (var session = sessionFactory.OpenSession())
    {
        result = (List<coCity>)session.CreateCriteria(typeof(coCity)).List<coCity>();
    }

    return result;
}

```

When its still at application server data is retrieve correctly as image below
[alt text http://img138.imageshack.us/img138/1071/serverside.png](http://img138.imageshack.us/img138/1071/serverside.png)

However when this data transit back to client side all of its PKs is loose like below.
[alt text http://img203.imageshack.us/img203/1664/clientside.png](http://img203.imageshack.us/img203/1664/clientside.png)