public ActionResult Group(int?id)
        {
            var group = new SolarSystemGroup();

            using (var session = DB.Instance.GetSession())
            {
                if (id.HasValue)
                {
                    group = session.Load <SolarSystemGroup>(id);
                }
            }
            return(View(group));
        }
 public ActionResult Group(int?id, SolarSystemGroup group)
 {
     using (var session = DB.Instance.GetSession())
     {
         if (id.HasValue)
         {
             var oldGroup = session.Load <SolarSystemGroup>(id);
             oldGroup.Name = group.Name;
         }
         else
         {
             session.Store(group);
         }
         session.SaveChanges();
     }
     return(RedirectToAction("Groups"));
 }