Problem with modifying List

Question

Hi

I'm struggling with this loop. It gives me "Collection was modified; enumeration operation may not execute."
I think it is about changing the CarsList. The RentIn method adds the car object to CarsList. So it modifies the list in the foreach loop. If I am correct, how could I use these methods? Since they modify the list on the run. I don't see any other way to do it, without foreach.

foreach (CarRental carRental in CarRentalProgram.CarRentalsList){

   foreach (Car car in carRental.CarsList){

      if(car.Name == "Mercedes"){

      car.Status = CarStatus.Out;

      carRental.RentIn(car, 33, carRental.ID);

      break;

      }

   }

}

Thank you