public History Create(HistoryModel model)
 {
     return(new History
     {
         PeriodId = model.PeriodId,
         EndDate = model.EndDate,
         StartDate = model.StartDate,
         CreatedBy = model.CreatedBy
     });
 }
        public HistoryModel(History histories)
        {
            this.Assign(histories);

            Periods = new HistoryModel();
        }