List vs Array

List vs Array

List is dynamic size and array is fixed size.

If You can add new elements to a list, but to add a new element to an array you need to create a new larger array and copy the old elements.

Arrays are a little leaner and more efficient if you don't need dynamic resizing, but lists are usually more convenient and the performance difference rarely matters for most applications.

For more information. 

http://stackoverflow.com/questions/434761/array-versus-listt-when-to-use-which