[fluent-nhib] Nhibernate with Switch

[adherence]

Hey Everyone..
 i  need to  return the  Ilist corresponding to the cases.

 i have a problem in   switch.
1-    when   i m  Returning a  value , it  gives error  ("Not all
paths  return a value")

and

2-    when i  put  return outside the  switch block  or outside the
case ,it gives  error ("the retval doesnt exist in the current

context")

please  help ..


 public object GetAll(object _oplObj)
        {
            using (NHibernate.ISession session = OpenSession())
            {
                using (ITransaction transaction =
session.BeginTransaction())
                {
                    ICriteria crit =
session.CreateCriteria(_oplObj.GetType());

         switch (_oplObj.GetType().ToString())
                            {
                             case "IMS":
                              break;
                        case "TPF":
                         IList<Jinnah.ObjectPersistanceLayer.TPF>
retval = crit.List<Jinnah.ObjectPersistanceLayer.TPF>();
                         return  retval;
                        break;
                            }

        }
            }
        }

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