public static void AddServiceCharges(int memberId, ServiceCharge charge)
 {
     if (!serviceCharges.ContainsKey(memberId))
     {
         serviceCharges[memberId] = new List <ServiceCharge>();
     }
     serviceCharges[memberId].Add(charge);
 }
 public void AddServiceCharge(int memberId, ServiceCharge serviceCharge)
 {
     PayrollDatabase.AddServiceCharges(memberId, serviceCharge);
 }