var list = new List<string> {
"test1",
"test2",
"test3"
};
List<string> optionList = new List<string>
{ "AdditionalCardPersonAdressType", /* rest of elements */ };
List<string> mylist = new List<string>(new string[] { "element1", "element2", "element3" });
List<T> a = new List<T>(..size, ..other object);