MainMaybeM.cs

static void Main(string[] args) {
  //-1) Maybe monad usage: input regular string, intermediate result int...
  var maybeM = new MaybeM<string>("I'm a string, wrapped up in the Maybe Monad!");
  var result1 = maybeM.Bind(ExtractVowels)
		      .Bind(Length);
  WriteLine("Result is: \{result1.Show()}");

  //-2) Maybe monad usage: null string
  maybeM = new MaybeM<string>(null);
  var result2 = maybeM.Bind(ExtractVowels)
		      .Bind(Length);
  WriteLine("Result is: \{result2.Show()}");

  //-3) Writer monad usage
  var writerM = new WriterM<string>("I'm a string, wrapped up in the Maybe Monad!");
  var result3 = writerM.Bind(ExtractVowels)
		       .Bind(Length);
  WriteLine("Result is: \{result3.Show()}");
  ReadLine();
}