Bỏ dấu tiếng việt

     static string ConvertCombiningDiacriticsToPrecomposed(string input)

    {

        string normalized = input.Normalize(NormalizationForm.FormD);

        StringBuilder precomposed = new StringBuilder();

        foreach (char c in normalized)

        {

            UnicodeCategory category = CharUnicodeInfo.GetUnicodeCategory(c);

            if (category != UnicodeCategory.NonSpacingMark)

            {

                precomposed.Append(c);

            }

        }

        return precomposed.ToString().Normalize(NormalizationForm.FormC);

    }

    static string ConvertCombiningDiacriticsToPrecomposedWithoutRemovingDiacritics(string input)

    {

        return input.Normalize(NormalizationForm.FormC);

    }