C#'s ternery operator needs left hand side?

Omake.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TernaryOperatorTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string s;
            Enumerable.Range(1, 100).Select((i) =>
            {
                return (s = (i % 3 == 0 ? "Fizz" : "") + (i % 5 == 0 ? "Buzz" : "")) == "" ? i.ToString() : s;
            }).ToList().ForEach(Console.WriteLine);

            Console.Read(); // don't close console window
        }
    }
}

TernaryOperatorTest.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TernaryOperatorTest
{
    static class IntTimes
    {
        public static void Times(this int len, Action<int> func)
        {
            for(int i = 1; i <= len; ++i) func(i);
        }
    }

    class Program
    {
        static bool IsFizz(int i) { return i % 3 == 0; }
        static bool IsBuzz(int i) { return i % 5 == 0; }

        static int DoFizzBuzz() { Console.WriteLine("FizzBuzz"); return 0; /* dummy */ }
        static int DoFizz() { Console.WriteLine("Fizz"); return 0; /* dummy */ }
        static int DoBuzz() { Console.WriteLine("Buzz"); return 0; /* dummy */ }
        static int Else(int i) { Console.WriteLine(i); return 0; /* dummy */ }

        static void Main(string[] args)
        {
            (100).Times((i) => {
                int dummy = IsFizz(i) && IsBuzz(i) ? DoFizzBuzz() :
                                         IsFizz(i) ? DoFizz() :
                                         IsBuzz(i) ? DoBuzz() :
                                                     Else(i);
            });

            Console.Read(); // don't close console window
        }
    }
}