public List <_Activity> GetCheckList()
{
DataTable ds = dal.GetCheckList();
List <_Activity> list = new List <_Activity>();
list.AddRange(ModelConvertHelper <_Activity> .ConvertToList(ds).OrderByDescending(a => Convert.ToDateTime(a.ActivityCreateTIme).ToString("yyyy-MM-dd")).ThenByDescending(a => a.PVCount).ToList());
return(list);
}