i am working with nhibernate ,

In my project i have made a class



namespace NHibernateExercise
{
[NHibernate.Mapping.Attributes.Class(0, Name = "NHibernateExercise.Car", Table = "Car")]
public class Car
{
private string carNo;
[NHibernate.Mapping.Attributes.Property(1,Name="CarNo",Column="CarNo", Type= "string",NotNull=true)]
public string CarNo
{
get { return carNo; }
}

}
}


and i am have modified hibernate.cfg.xml to support the database i need


<?xml version="1.0" encoding="utf-8" ?>

<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
<session-factory name="NHibernateExercise">
<property name="connection.connection_string">Server=XXXXX;Port=1234;Provider=Sybase.Data.AseClient;Initial Catalog=AAA; Data Source=AAA;User ID=aa;Password=****</property>
<property name="show_sql">false</property>
<property name="dialect">NHibernate.Dialect.SybaseDialect</property>
<property name="user_outer_join">true</property>
<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N' </property>
<mapping assembly="NHibernateExercise"/>

</session-factory>

</hibernate-configuration>


now the class that uses these is

public class CarProcessor
{

private const string CurrentSession="nhibernate.current_session";
public static void Main(string[] args)
{

try
{

ISessionFactory sessionFactory = new Configuration().Configure().BuildSessionFactory();
ISession session = sessionFactory.OpenSession();
ITransaction transaction = session.BeginTransaction();
bool available = session.IsConnected;

Car car = new Car();
car= (Car)session.Load(Type.GetType("Car"), "123");


transaction.Commit();
session.Close();
sessionFactory.Close();


}
catch (Exception e)
{
string exp = e.ToString();
}
}
}

when i run this file i got the following exception on "car= (Car)session.Load(Type.GetType("Car"), "123");"



System.NullReferenceException: Object reference not set to an instance of an object.
at NHibernate.Impl.SessionImpl.DoLoadByClass(Type clazz, Object id, Boolean checkDeleted, Boolean allowProxyCreation)
at NHibernate.Impl.SessionImpl.Load(Type clazz, Object id)



the value of session.IsConnected it true that means it is connected to DB but the persistant object is not found or null or some other reason is there.

Type.GetType() requires an assembly-qualified name. Use either typeof(Car) or use the generic overload for Load that takes the type as a generic argument if you're using .NET 2.0.

I.e. if you are using .NET 1.x, use:

If you are using .NET 2.0, you can use the cleaner generic call: