static string RemoveDiacritics(string stIn)
        {
            string stFormD = stIn.Normalize(NormalizationForm.FormD);
            StringBuilder sb = new StringBuilder();
 
            for (int ich = 0; ich < stFormD.Length; ich++)
            {
                UnicodeCategory uc = CharUnicodeInfo.GetUnicodeCategory(stFormD[ich]);
                if (uc != UnicodeCategory.NonSpacingMark)
                {
                    sb.Append(stFormD[ich]);
                }
            }
 
            return (sb.ToString().Normalize(NormalizationForm.FormC));
        }