using System;

public class Program

{

    public static void Main()

    {

        string str = "this is       a test of  the            space separator";

        string[] els = str.Split(' ');

        for (int i=0; i < els.Length; i++) {

            string test = String.IsNullOrEmpty(els[i]) ? "is null/empty" : "not null/empty";

            Console.WriteLine(string.Format("{0}={1} [{2}] {3}", i, els[i], test, els[i].Length));

        }

    }

}