public void Update(WatchListGroup group)
{
if (group.WatchListGroupId == 0)
{
throw new System.Exception("Group does not exists");
}
var watchList = _watchListRepository.GetById(group.WatchListGroupId);
if (watchList == null)
{
throw new System.Exception("Group does not exists");
}
_watchListRepository.Attach(watchList);
watchList.InjectFrom(group);
_watchListRepository.SaveChanges();
}