public virtual IList FindMembershipsByUserAndGroup(String userName, String groupId, Relations relations) { IList memberships = null; DbSession dbSession = null; try { dbSession = OpenSession(); memberships = implementation.FindMembershipsByUserAndGroup(userName, groupId, relations, dbSession); } catch (Exception t) { log.Error("error when finding membership by username " + userName + " and group id " + groupId, t); } return(memberships); }