using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.CompilerServices;

public class Program {

  public static List<string> TupleToList(ITuple value) {

    if (null == value)

      throw new ArgumentNullException("value");

​

    return Enumerable

     .Range(0, value.Length)

     .Select(i => value[i].ToString()) // ?. - don't call ToString() on null

     .ToList();

  }

  public static void Main() {

    List<string> result = TupleToList(Tuple.Create("word", 1, 's', "US"));  

    Console.WriteLine(string.Join(", ", result));

​

  }

}