Using out keyword

using System;

namespace OutErrors
{
  class Program
  {
    static void Main(string[] args)
    {
      string statement = "GARRRR";
      bool marker;
      string murmur = Whisper(statement,out marker); //when call method should also use out keyword
      Console.WriteLine(murmur);
    }

    static string Whisper(string phrase, out bool wasWhisperCalled)
    {
      wasWhisperCalled = true; //out parameter must be assigned a value before the return statement
      return phrase.ToLower();
    }
  }
}