Create URL Safe and Cryptographically Strong Short GUID, C#

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//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.Text;
using System.Security.Cryptography;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            byte[] bytes = new byte[16];
            using (var provider = System.Security.Cryptography.RandomNumberGenerator.Create())
            {
                provider.GetBytes(bytes);
            }
            
            var guid = new Guid(bytes);
            
            Console.WriteLine(guid);

var shortGuid = guid.ToShortString();
            
            Console.WriteLine(shortGuid);
        }                     
    }
    
    public static class GuidHelper {        
        public static string ToShortString(this Guid guid)
        {
            return Convert.ToBase64String(guid.ToByteArray())
                .Substring(0, 22)
                .Replace("/", "_")
                .Replace("+", "-");
        }
    }  
}

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Compilation time: 0,12 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3