Can I retrieve the index position of an element in a list?

I have the following list:

开发者_JS百科private List<Car> _cars = new List<Car>();

I know I can check the size of the list with _cars.Count() but is it also possible for me to find out the sequence number of a Car item in the list?

The "Sequence Number" you are after is referred to as Index:

If you define a Car:

 Car myCar = new Car(){Make = "Ford", Model="Escort"};
 _cars.Add(myCar);

Then you obtain the Index as follows:

 int index = _cars.IndexOf(myCar);

If this is the only item in the list then index will be 0

Check IndexOf Method : MSDN

List<T>.IndexOf(T)

MSDN has a good example.

You can use List.IndexOf(). Check out the List Class reference for more about what you can do with a list.

Car car = new Car(...);
_cars.IndexOf(car);

_cars.indexof(T) Searches for the specified object and returns the zero-based index of the first occurrence within the entire List.