>>I have updated my answer
>
>I have a compiler warning (green underline) under this test
>
>
> public static Int32 Occurs(this String source, char pattern)
> {
> if (null==pattern)
> return 0;
> return source.Split(pattern).Length - 1;
> }
>
>It is saying that value of type int never equals null.
>
>So, do I really need this test here for char?
Value types are never null - unless declared as nullable
Gregory