NHibernate Hello World (View associated the blog post here: http://julian.maughan.id.au/2012/12/hello-world-of-nhibernate-world.html)

Customer.cs

using System;

namespace NHibernateHelloWorld
{  
 	public class Customer
	{
		public virtual Guid Id { get; set; }
		public virtual string Name { get; set; }
	}
}

Program.cs

using System;
using NHibernate.Cfg;
using NHibernate.Dialect;
using NHibernate.Mapping.ByCode;
using NHibernate.Tool.hbm2ddl;

namespace NHibernateHelloWorld
{
	/// <summary>
	/// NHibernate Hello World - with by-code configuration and mappings
	/// </summary>
	/// <remarks>
	/// Dependencies:
	/// - Add NHibernate to your project using NuGet, i.e. 'Install-Package NHibernate'
	/// - Update the connection string and dialect/driver for your database, as required
	/// </remarks>
	class Program
	{
		static void Main()
		{
			// Configure NHibernate
			var configuration = new Configuration();

			configuration.SessionFactory()
				.Integrate.Using<MsSql2008Dialect>()
				.Connected.Using("Server=localhost;Database=nhibernate;Integrated Security=SSPI");
			
			// Mappings
			var mapper = new ModelMapper();

			mapper.Class<Customer>(rc =>
			{
				rc.Id(x => x.Id, m => m.Generator(Generators.Guid));
				rc.Property(x => x.Name);
			});
			
			// Add mappings to configuration
			var mapping = mapper.CompileMappingForAllExplicitlyAddedEntities();

			configuration.AddMapping(mapping);
			
			// Export schema - i.e. create the Customer table
			new SchemaExport(configuration).Create(false, true);
			
			// Use NHibernate
			using (var sessionFactory = configuration.BuildSessionFactory())
			{
				// Persist a customer entity
				using (var session = sessionFactory.OpenSession())
				{
					var customer = new Customer { Name = "Aristotle" };
					session.SaveOrUpdate(customer);
					session.Flush();
				}
			}
			
			Console.ReadLine();
			
			// Drop schema - i.e. drop the Customer table
			new SchemaExport(configuration).Drop(false, true);
		}
	}
}