using System;

using System.Text;

public class Program

{

    public static void Main()

    {

             var r = Encoding.GetEncoding(1252, new EncoderReplacementFallback(string.Empty), new DecoderExceptionFallback() );

             string inputString = "Räksmörgås são";

             string asAscii = Encoding.GetEncoding(1252).GetString(

                 Encoding.Convert(Encoding.UTF8,r , Encoding.UTF8.GetBytes(inputString) ) 

                 );

        Console.WriteLine(asAscii);

    }

}