Reference

link 1

Differences

IList and List can only store same type values, but ArrayList can store diff types, For example:


IList an_ilist = new IList<string>();
an_ilist.Add("this")
an_ilist.Add("is")
an_ilist.Add("ilist")

List a_list = new List<string>();

ArrayList an_arraylist = new ArrayList();
an_arrayList.Add("Hello");
an_arraylist.Add(99);

Performence

When the size of data need to store larger than 50000, List<T> performs better. 
So in common use ArrayList as far as possible

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Published