public Car GetDataUsingDataContract(Car car)
 {
     if (car == null)
     {
         throw new ArgumentNullException("composite");
     }
     if (car.BoolValue)
     {
         car.StringValue += " added";
     }
     return car;
 }
 public Car GetDataUsingDataContract(Car car)
 {
     if (car == null)
     {
         throw new ArgumentNullException("composite");
     }
     if (car.IsAvailable)
     {
         car.Company += " Booked";
     }
     return car;
 }