How and when to abandon the use of arrays in C#?

Question

I\'ve always been told that adding an element to an array happens like this:

An empty copy of the array+1element is created and then the data from t

Answer 1

If I think I'm going to be adding items to the collection a lot over its lifetime, than I'll use a List. If I know for sure what the size of the collection will be when its declared, then I'll use an array.

Another time I generally use an array over a List is when I need to return a collection as a property of an object - I don't want callers adding items that collection via List's Add methods, but instead want them to add items to the collection via my object's interface. In that case, I'll take the internal List and call ToArray and return an array.