CSHARP

instantiate list C#

var list = new List<string> {
  "test1",
  "test2",
  "test3"
};

initialize list in c#

List<string> optionList = new List<string>
            { "AdditionalCardPersonAdressType", /* rest of elements */ };

instantiate list C#

List<string> mylist = new List<string>(new string[] { "element1", "element2", "element3" });