using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string fullName1 = string.Join(",", (new string[] { "LastName", "FN", "Del Rio" }).Where(n => !string.IsNullOrEmpty(n)));

        string fullName2 = string.Join(",", (new string[] { "LastName", "FN de Jesus", "" }).Where(n => !string.IsNullOrEmpty(n)));

        Console.WriteLine(fullName1);

        Console.WriteLine(fullName2);

    }

}