String helper: to url fragment

gistfile1.cs

        // credit: http://www.extensionmethod.net/Details.aspx?ID=453
        public static string ToUrlFragment(this string s)
        {
            if (String.IsNullOrEmpty(s)) return "";
            // Unicode Character Handling: http://blogs.msdn.com/b/michkap/archive/2007/05/14/2629747.aspx
            string stFormD = s.Trim().ToLowerInvariant().Normalize(NormalizationForm.FormD);
            var sb = new StringBuilder();
            foreach (var t in from t in stFormD let uc = CharUnicodeInfo.GetUnicodeCategory(t) where uc != UnicodeCategory.NonSpacingMark select t)
            {
                sb.Append(t);
            }
            return Regex.Replace(sb.ToString().Normalize(NormalizationForm.FormC), "[\\W\\s]{1,}", "-").Trim('-');
        }