Adding List.add() another list

Question

I have an IEnumerable and I am trying to add the vales in the for-loop to a List. I keep get

Answer 1

List<T>.Add adds a single element. Instead, use List<T>.AddRange to add multiple values.

Additionally, List<T>.AddRange takes an IEnumerable<T>, so you don't need to convert tripDetails into a List<TripDetails>, you can pass it directly, e.g.:

tripDetailsCollection.AddRange(tripDetails);