Ignoring accented letters in string comparison

string s1 = "hello";
string s2 = "héllo";

s1.Equals(s2, StringComparison.InvariantCultureIgnoreCase);
s1.Equals(s2, StringComparison.OrdinalIgnoreCase);

static string RemoveDiacritics(string text)
{
  string formD = text.Normalize(NormalizationForm.FormD);
  StringBuilder sb = new StringBuilder();

  foreach (char ch in formD)
  {
    UnicodeCategory uc = CharUnicodeInfo.GetUnicodeCategory(ch);
    if (uc != UnicodeCategory.NonSpacingMark)
    {
      sb.Append(ch);
    }
  }

  return sb.ToString().Normalize(NormalizationForm.FormC);
}

Debug.Assert("hello"==RemoveDiacritics("héllo"));

private static bool CompareIgnoreAccents(string s1, string s2)
{
    return string.Compare(
        RemoveAccents(s1), RemoveAccents(s2), StringComparison.InvariantCultureIgnoreCase) == 0;
}

private static string RemoveAccents(string s)
{
    Encoding destEncoding = Encoding.GetEncoding("iso-8859-8");

    return destEncoding.GetString(
        Encoding.Convert(Encoding.UTF8, destEncoding, Encoding.UTF8.GetBytes(s)));
}

public static string RemoveAccents(this string s)
{
    Encoding destEncoding = Encoding.GetEncoding("iso-8859-8");

    return destEncoding.GetString(
        Encoding.Convert(Encoding.UTF8, destEncoding, Encoding.UTF8.GetBytes(s)));
}

if(string.Compare(s1.RemoveAccents(), s2.RemoveAccents(), true) == 0) {
   ...

string s1 = "hello";
string s2 = "héllo";

if (String.Compare(s1, s2, CultureInfo.CurrentCulture, CompareOptions.IgnoreNonSpace) == 0)
{
    // both strings are equal
}

using System;
using System.Globalization;

class Sample {
    public static void Main() {
    String str1 = "change";
    String str2 = "dollar";
    String relation = null;

    relation = symbol( String.Compare(str1, str2, false, new CultureInfo("en-US")) );
    Console.WriteLine("For en-US: {0} {1} {2}", str1, relation, str2);

    relation = symbol( String.Compare(str1, str2, false, new CultureInfo("cs-CZ")) );
    Console.WriteLine("For cs-CZ: {0} {1} {2}", str1, relation, str2);
    }

    private static String symbol(int r) {
    String s = "=";
    if      (r < 0) s = "<";
    else if (r > 0) s = ">";
    return s;
    }
}
/*
This example produces the following results.
For en-US: change < dollar
For cs-CZ: change > dollar
*/