public PhieuDangKyHoatDong(int iMaHoatDong) { using (QuanLyDoanVienEntities db = new QuanLyDoanVienEntities()) { HoatDong hd = db.HoatDongs.Single(n => n.MaHoatDong == iMaHoatDong); this.MaHoatDong = iMaHoatDong; this.TenHoatDong = hd.TenHoatDong; this.NgayBatDau = hd.ThoiGianBauDau.Value; this.NgayKetThuc = hd.ThoiGianKetThuc.Value; this.DiaDiem = hd.DiaDiem; this.NgayDangKy = DateTime.Now; } }