public void InsertTinNhan(TinNhanBO tinnhanBO)
 {
     hoctuvungLINQDataContext db = new hoctuvungLINQDataContext();
     TinNhan tinnhan = new TinNhan();
     tinnhan.TinNhanID = Guid.NewGuid();
     tinnhan.Nguoigoi = tinnhanBO.NguoiGoi;
     tinnhan.Nguoinhan = tinnhanBO.NguoiNhan;
     tinnhan.NoiDung = tinnhanBO.NoiDung;
     tinnhan.NgayGoi = tinnhanBO.NgayGoi;
     tinnhan.XacNhan = false;
     db.TinNhans.InsertOnSubmit(tinnhan);
     db.SubmitChanges();
 }
 partial void DeleteTinNhan(TinNhan instance);
 partial void UpdateTinNhan(TinNhan instance);
 partial void InsertTinNhan(TinNhan instance);
		private void detach_TinNhans1(TinNhan entity)
		{
			this.SendPropertyChanging();
			entity.NguoiDung1 = null;
		}
		private void attach_TinNhans(TinNhan entity)
		{
			this.SendPropertyChanging();
			entity.NguoiDung = this;
		}