using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace NHibernate.Domain.Entities {[Serializable]public class Customer {#region Customerpublic virtual string CustomerID { get; set; }public virtual string CompanyName { get; set; }public virtual string ContactName { get; set; }public virtual string ContactTitle { get; set; }public virtual string Address { get; set; }public virtual string City { get; set; }public virtual string Region { get; set; }public virtual string PostalCode { get; set; }public virtual string Country { get; set; }public virtual string Phone { get; set; }public virtual string Fax { get; set; }#endregion}
}

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHibernate.Domain" namespace="NHibernate.Domain.Entities"><class name="NHibernate.Domain.Entities.Customer,NHibernate.Domain" table="Customers"><id name="CustomerID" column="CustomerID" type="string" unsaved-value="0"><generator class="increment"/></id><property name="CompanyName" column="CompanyName" type="string"  /><property name="ContactName" column="ContactName" type="string"  /><property name="ContactTitle" column="ContactTitle" type="string"  /><property name="Address" column="Address" type="string"  /><property name="City" column="City" type="string"  /><property name="Region" column="Region" type="string"  /><property name="PostalCode" column="PostalCode" type="string"  /><property name="Country" column="Country" type="string"  /><property name="Phone" column="Phone" type="string"  /><property name="Fax" column="Fax" type="string"  /></class>
</hibernate-mapping>

using NHibernate.Cfg;namespace NHibernate.DataPortal {public class NHibernateHelper {private ISessionFactory _sessionFactory;public NHibernateHelper() {_sessionFactory = GetSessionFactory();}private ISessionFactory GetSessionFactory() {return (new Configuration()).Configure().BuildSessionFactory();}public ISession GetSession() {return _sessionFactory.OpenSession();}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NHibernate.Domain.Entities;namespace NHibernate.DataPortal {public class CustomerDal {private NHibernateHelper nhibernateHelper = new NHibernateHelper();protected ISession Session { get; set; }public CustomerDal() {this.Session = nhibernateHelper.GetSession();}public CustomerDal(ISession session) {this.Session = session;}public void CreateCustomer(Customer customer) {Session.Save(customer);Session.Flush();}public Customer GetCustomerById(int customerId) {return Session.Get<Customer>(customerId);}public IList<Customer> GetCunstomers() {IList<Customer> list = null;list = Session.QueryOver<Customer>().List();return list;}}
}

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"><session-factory><property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property><property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property><property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property><property name="connection.connection_string">Server=.;initial catalog=northwind;Integrated Security=True</property><property name="proxyfactory.factory_class">NHibernate.Bytecode.DefaultProxyFactoryFactory,NHibernate</property>    <property name="show_sql">true</property><property name="command_timeout">10</property><property name="adonet.batch_size">10</property><property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property><mapping assembly="NHibernate.Domain" /></session-factory>
</hibernate-configuration>

protected override void OnLoad(EventArgs e) {try {NHibernate.DataPortal.CustomerDal customerDal = new NHibernate.DataPortal.CustomerDal();this.dgvCustomerList.DataSource = customerDal.GetCunstomers();} catch (Exception ex) {throw new Exception(ex.Message);}}