Capitalizes words. "hello world" => "Hello World"

UpperWords.cs

namespace Utils
{
    public static class Util
    {
        public static string UpperFirstChar(string s)
        {
            if (s == null) return null;
            if (s.Length == 1) return s.ToUpper();
            if (s.Length > 1) return char.ToUpper(s[0]) + s.Substring(1);
            return s;
        }

        public static string UpperWords(string s)
        {
            if (s == null) return null;
            return s.Split(' ')
                .Select(e => UpperFirstChar(e))
                .Aggregate((current, next) => current + " " + next);
        }
    }
}