在nhibernate中使用联接

我的应用程序代码如下所示

表格

tblPerson
---------
PersonId (PK)
Name
tblAddress
----------
AddressId(PK)
Address
PersonAddress
-------------
PersonId (PK)
AddressId

实体类

PersonAddresstbl.cs

public class PersonAddressl
{
    private int personid;
    private int addressid;
    private string name;
    public virtual int PersonId
    {
        get { return personid; }
        set { personid = value; }
    }
    public virtual int AddressId
    {
        get { return addressid; }
        set { addressid = value; }
    }
    public virtual string Name
    {
        get { return name; }
        set { name = value; }
    }
}

xml文件

个人地址tbl.hbn.xml

<class name="PersonAddressl">
  <id name="id" column="PersonId">
    <generator class="native"/>
  </id>
  <join table="tblPersonAddress"
      optional="true">
    <key column="PersonId"
        unique="true"/>
    <many-to-one name="Address"
        column="AddressId"/>
  </join>
</class>
<class name="tblAddress">
  <id name="id" column="AddressId">
    <generator class="native"/>
  </id>
</class>

实现是

PersonAddresstbl tbl = new PersonAddresstbl();
Criteria crit = session.CreateCriteria(typeof(PersonAddresstbl));
IList lst = crit.List();

返回0条记录。

有人能告诉我我走的是正确的路还是哪里错了吗？

谢谢，Pavan