Reverse a string

using System;
using System.Collections.Generic;
using System.Linq;

class MainClass {
    static void Main() {
       Console.WriteLine(ReverseString("Hello World !"));
    }
    
    public static string ReverseString(string str)
    {
        char[] charArray = str.ToCharArray();
        Array.Reverse(charArray);
        return new string(charArray);
    }
}