using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string s = @"   some bad symbols    ";

        string s2 = @"   spaces  ";

​

        Console.WriteLine(s.Reverse().SkipWhile(char.IsControl).Reverse().SkipWhile(char.IsControl).ToArray());

        Console.WriteLine(s.Trim());

​

        Console.WriteLine(s2.Reverse().SkipWhile(char.IsControl).Reverse().SkipWhile(char.IsControl).ToArray());

        Console.WriteLine(s2.Trim());

​

    }

}