SEO slug

public static string Slug(string s)
{
     s = s.Normalize(NormalizationForm.FormD);
     StringBuilder sb = new StringBuilder();
     foreach (char c in s) {
        if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark){
            sb.Append(c);
        }
    }
     s = sb.ToString().Normalize(NormalizationForm.FormC);
     s = Regex.Replace(s, "[^a-z0-9_\-]+", "-", RegexOptions.IgnoreCase);
     s = s.Trim(new char[] { "-" });
     return s;
}