public void Exclui(TiposDespesas despesa)
        {
            ITransaction transaction = session.BeginTransaction();

            session.Delete(despesa);
            transaction.Commit();
        }
        public void Altera(TiposDespesas despesa)
        {
            ITransaction transaction = session.BeginTransaction();

            session.Merge(despesa);
            transaction.Commit();
        }
        public void Adiciona(TiposDespesas despesa)
        {
            ITransaction transaction = session.BeginTransaction();

            session.Save(despesa);
            transaction.Commit();
        }