IQuery query = session.CreateQuery(
   "SELECT E.account.id, E.equipmentType.id, SUM(E.quantity) " +
   "FROM Entry AS E " +
   "WHERE E.when >=:startDate AND E.when <:endDate " +   
   "GROUP BY E.account.id, E.equipmentType.id");
   query.SetParameter("startDate", startDate.ToLongDateString());
   query.SetParameter("endDate", endDate.ToLongDateString());

   System.Collections.IList entries = query.List();

   System.Collections.IList<MyQuery> entries = query.List<MyQuery>();

static List<T> Generify<T>(IList li) {
   List<T> result = new List<T>();
   foreach (object obj in li) {
      result.Add((T) obj;
   }
   return result;
}