C# Online Compiler | .NET Fiddle

using System; using System.Text; using System.Linq; using System.Diagnostics; 
					
public static class Program
{
	// Based on http://www.codeproject.com/Articles/13503/Stripping-Accents-from-Latin-Characters-A-Foray-in
	// Proper Normalization
	public static string UnicodeToAscii(this string s)
	{
		var sb = new StringBuilder(s.Length);
		sb.Append(s.Normalize(NormalizationForm.FormKD)
								.Where(x => (x > 30 && x < 128))
								.ToArray());
		return sb.ToString();
	}
	
	//ANSI characters 32 to 127 correspond to those in the 7-bit ASCII character set,
	public static string ReducetoASCII(this string s)
    {
        StringBuilder sb = new StringBuilder(s.Length);
        foreach (char c in s)
        {
            if ((int)c > 127) // remove chars > 127
                continue;
            if ((int)c < 32)  // remove  control characters 
                continue;
            sb.Append(c);
        }
        return sb.ToString();
    }
	
	public static void Main()
	{
		Stopwatch sw = new Stopwatch(); 
		string french = "A Paris, le cortège parisien s’était élancé à 14 heures.\r\n\tFace à l’affluence, un «itinéraire bis» a été mis en place. D’importants rassemblements ont lieu à Bordeaux, Marseille, Rennes ou Lyon. Suivez la journée avec nos journalistes dans toute la France.";
		string ftemp = string.Empty; 
		string german = "Trump\t\r\nverwechselt Klägerin Carroll auf Foto mit Ex-Frau – das könnte Folgen haben"; 
		string gtemp = string.Empty; 
		Console.WriteLine(french); 
		
		sw.Start();
		ftemp = french.ReducetoASCII(); 
		sw.Stop(); 
		
		Console.WriteLine("Ansi reduced\r\n" + ftemp + " in " + sw.ElapsedTicks); 
		
		sw.Reset(); 
		sw.Start();
		ftemp = french.UnicodeToAscii(); 
		sw.Stop(); 
		
		Console.WriteLine("Proper Normalization\r\n" + ftemp + " in " + sw.ElapsedTicks); 
				
		Console.WriteLine();
		Console.WriteLine();
		Console.WriteLine(german); 
		
		sw.Reset();
		sw.Start();
		gtemp = german.ReducetoASCII(); 
		sw.Stop(); 
		
		Console.WriteLine("Ansi reduced\r\n" + gtemp + " in " + sw.ElapsedTicks); 
		
		sw.Reset(); 
		sw.Start();
		gtemp = german.UnicodeToAscii(); 
		sw.Stop(); 
		
		Console.WriteLine("Proper Normalization\r\n" + gtemp + " in " + sw.ElapsedTicks); 
		
	}
}

 
using System; using System.Text; using System.Linq; using System.Diagnostics; 
                    
public static class Program
{
    // Based on http://www.codeproject.com/Articles/13503/Stripping-Accents-from-Latin-Characters-A-Foray-in
    // Proper Normalization
    public static string UnicodeToAscii(this string s)
    {
        var sb = new StringBuilder(s.Length);
        sb.Append(s.Normalize(NormalizationForm.FormKD)
                                .Where(x => (x > 30 && x < 128))
                                .ToArray());
        return sb.ToString();
    }
    
    //ANSI characters 32 to 127 correspond to those in the 7-bit ASCII character set,
    public static string ReducetoASCII(this string s)
    {
        StringBuilder sb = new StringBuilder(s.Length);
        foreach (char c in s)
        {
            if ((int)c > 127) // remove chars > 127
                continue;
            if ((int)c < 32)  // remove  control characters 

Cached Result

text: tex1t
number: 1
enum: Item1
child[0].Value: text2
other@[0]: ignored1
other*[0]: ignored3