public class TestA{
    private int id;
    private string someData;

    public int Id {
        get { return id; }
        set { id = value; }
    }

    public int Data {
        get { return someData; }
        set { someData = value; }
    }

    public TestA()
    {}
}

...
void someMethod(ISession session)
{
    TestA a = new TestA();

    a.Id = 2; // using some object with Id 2 in the database

    session.Refresh(a);

    /* I expect for the data from the database of the object
        that have the Id = 2 to be loaded, but it doens't
    */
    Console.WriteLine("Id: {0} Data: {1}", a.Id, a.Data);

    /* And if I call the method ISession.Load for example
        I will have an error, because it says that the object already
        was loaded.
    */
    session.Load(a, a.Id); // or a = (TestA) session.Load(typeof(TestA), 2);
}
...