BKI_DichVuMatDat.BaoCao.ThuNhapKhac.f492_bao_cao_cac_he_so.get_ngay_dau_nam C# (CSharp) Method

        private DateTime get_ngay_dau_nam()
        {
            return DateTime.Now.AddDays(-DateTime.Now.Day + 1).AddMonths(-DateTime.Now.Month + 1).Date;
        }