Hi all,
I have a problem when I create session factory from configuration objects, I always catch an issue:
Association references unmapped class: Order

my create session factory code:

Configuration cfg = new Configuration()
.AddAssembly("NHibernateSimpleDemo");
m_SessionFactory = cfg.BuildSessionFactory();

my Order.hbm.xml file:

<?xml version="1.0"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" schema="dbo">

<!-- Mappings for class 'Order' -->
<class name="NHibernateSimpleDemo.Order, NHibernateSimpleDemo" lazy="false" >

<!-- Identity mapping -->
<id name="ID" column="OrderID" type="Int32">
<generator class="native" />
</id>

<!-- Simple mappings -->
<property name="Date" column="Date" />

<!-- Many-to-one mapping: Customer -->
<many-to-one name="Customer" column="CustomerID" class="NHibernateSimpleDemo.Customer, NHibernateSimpleDemo"
cascade="none" />

<!-- Many-to-many mapping: OrderItems -->
<bag name="OrderItems" table="OrderItems" cascade="none" lazy="false">
<key column="OrderID" />
<many-to-many class="NHibernateSimpleDemo.Product, NHibernateSimpleDemo" column="ProductID" />
</bag>

</class>

</hibernate-mapping>

I already set hbm.xml files to "embedded resource"

Any help will be appeciated

Thanks all

Make sure you 'rebuild' the entire solution, so that the embedded resource actually gets included in your DLL. Also, make sure your column names in your Order.hbm.xml file match your 'Order' table. The demo had the column names 'OrderDate' and 'Customer', not 'Date' and 'Customer' as you have specified.