//Rextester.Program.Main is the entry point for your code. Don't change it.

//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

using System.Text;

using System.Globalization;

​

namespace Rextester

{

    public class Program

    {

        public static void Main(string[] args)

        {

            //Your code goes here

            Console.WriteLine(RemoveDiacritics("à spécifie sans oubli (ô,î,ê,é,è …) !"));

        }

        static string RemoveDiacritics(string text) 

{

    var normalizedString = text.Normalize(NormalizationForm.FormD);

    var stringBuilder = new StringBuilder();

​

    foreach (var c in normalizedString)

    {

        var unicodeCategory = CharUnicodeInfo.GetUnicodeCategory(c);

        if (unicodeCategory != UnicodeCategory.NonSpacingMark)

        {

            stringBuilder.Append(c);

        }

    }

​

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

}

    }

}