Counting how many times a certain char appears in a string before any other char appears

Question

I have many strings. Each string is prepended with at least 1 $. What is the best way to loop through the chars of each string to count how many $\

Answer 1

int count = myString.TakeWhile(c => c == '$').Count();

And without LINQ

int count = 0;
while(count < myString.Length && myString[count] == '$') count++;