NHibernate and ASP.NET - Part 2

public class NHManager
{
   public NHManager()
   {
     //load config

     //create session factory
   }
}

public abstract class BusinessBase
{
  private static NHManager _mgr = null;
  [ThreadStatic()]
  protected static NHManager Manager
  {
    get 
    { 
      if( _mgr == null) 
        _mgr = new NHManager();
      return _mgr;
    }
  }

  private ISession _session = null;
  protected ISession CurrentSession
  {
    get
    {
      if( _session == null )
      {
        //see if context contains it
        if( HttpContext.Current[NHSESSION] == null ) 
        //key is a constant
        {
          
          //this is the first access for this request, 
          //load the object
          
          _session = Manager.OpenSession();
          HttpContext.Current[NHSESSION] = _session;
        }
        else
        {
          //it exists in this request
          _session = HttpContext.Current[NHSESSION] 
            as ISession;
        }
      }
      //make sure it's connected
      if(! _session.IsConnected)
        _session.ReConnect();
      return _session;
    }
  }
}