String.IsNullOrEmpty() Check for Space

Question

What is needed to make String.IsNullOrEmpty() count whitespace strings as empty?

Eg. I want the following to return true instead of the usu

Answer 1

String.IsNullOrEmpty(" ")

...Returns False

String foo = null;
String.IsNullOrEmpty( foo.Trim())

...Throws an exception as foo is Null.

String.IsNullOrEmpty( foo ) || foo.Trim() == String.Empty

...Returns true

Of course, you could implement it as an extension function:

static class StringExtensions
{
    public static bool IsNullOrWhiteSpace(this string value)
    {
        return (String.IsNullOrEmpty(value) || String.IsNullOrEmpty(value.Trim()));
    }
}