public Nullable <DateTime> getT_TwelveMonthDue()
 {
     if (calc_T_TwelveMonthDue == null)
     {
         if (T_HireDate != null)
         {
             calc_T_TwelveMonthDue = (T_HireDate.AddMonths(Convert.ToInt32(12)));
         }
         else
         {
             calc_T_TwelveMonthDue = null;
         };
     }
     return(calc_T_TwelveMonthDue);
 }
 public void setCalculation()
 {
     try{ this.calc_T_ThreeMonthDue  = this.calc_T_ThreeMonthDue = this.T_ThreeMonthDue = (T_HireDate.AddMonths(Convert.ToInt32(3)));
          this.calc_T_SixMonthDue    = this.calc_T_SixMonthDue = this.T_SixMonthDue = (T_HireDate.AddMonths(Convert.ToInt32(6)));
          this.calc_T_TwelveMonthDue = this.calc_T_TwelveMonthDue = this.T_TwelveMonthDue = (T_HireDate.AddMonths(Convert.ToInt32(12))); }catch {}
 }