public override string ToString()
 {
     return($@"EntityId: {EntityId}, 
 EntityType: {EntityType}, 
 IntervalType: {IntervalType}, 
 ContractDayStart: {ContractDayStart.ToString("MM/dd/yyyy")}, 
 ContractDayEnd: {ContractDayEnd.ToString("MM/dd/yyyy")}");
 }
 public override string ToString()
 {
     return($@"MeasurementPointId: {MeasurementPointId}, 
 ContractDayStart: {ContractDayStart.ToString("MM/dd/yyyy")}, 
 ContractDayEnd: {ContractDayEnd.ToString("MM/dd/yyyy")}");
 }