Nhibernate with Asp.net WebForms - Session per Request

I am using an HttpModule to open a session that span each request and it works great with lazy loading and everything.

My concern is that since I open a new session per request (and stores it in HttpContext.Current.Items) it opens a session for every request even request including request f开发者_JAVA百科or .css files and images. I recall reading that session creation is a pretty lightwheigt operation (dont know about transactions though) but anyway it seems unnecessary to open a session for a requests for a .css file?

Anyone got some ideas about this, is it a problem and/or am I doing something stupid?

Thanks in advance

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• only create the session object if the file type is .aspx or .ashx:

      switch (context.Request.CurrentExecutionFilePathExtension.ToLower())
      {
          case ".aspx":
          case ".ashx":
              context.Items[ContextKey] = CreateMySession();
              break;
      }
  

• or encapsulate session creation inside a property getter, and clean-up checks whether session != null