ArrayList vs List<> in C#

Yes, pretty much. List<T> is a generic class. It supports storing values of a specific type without casting to or from object (which would have incurred boxing/unboxing overhead when T is a value type in the ArrayList case). ArrayList simply stores object references. As a generic collection, List<T> implements the generic IEnumerable<T> interface and can be used easily in LINQ (without requiring any Cast or OfType call).

ArrayList belongs to the days that C# didn’t have generics. It’s deprecated in favor of List<T>. You shouldn’t use ArrayList in new code that targets .NET >= 2.0 unless you have to interface with an old API that uses it.

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