public void LayThang() { DateTime now = DateTime.Now; txt_ngayBD.Text = now.ToLongDateString(); txt_NgayKT.Text = now.ToLongDateString(); int DoanhThu = int.Parse(tk.LayDoanhThu(now, now).ToString()); int TienNhap = int.Parse(tk.LayTienNhap(now, now).ToString()); BieuDO(DoanhThu, TienNhap); }