LINQ count character apperance

Question

Instead of looping over my string I'd like to use LINQ. How to do the following?

//  explode our word
List<char> rackBag = new List<char>();
rackBag.AddRange("MYWORD??".ToCharArray());

// How many wildcards?
int wildCardCount = rackBag.Count(x => x.Equals("?"));

wildCardCount should equal 2.

Answer 1

rackBag.Count(x => x == '?'); 

Answer 2

int wildCardCount = rackBag.Count(x => x=='?');

Answer 3

Lots of unneeded steps there. Try this:

int wildCardCount = "MYWORD??".Count(x => x == '?');