using System;

using Microsoft.AspNetCore.WebUtilities;

public class Program

{

    public static void Main()

    {

        Guid guid = Guid.NewGuid();

        Console.WriteLine(guid);

        var encodedGuid = EncodeGuid(guid);

        Console.WriteLine(encodedGuid);

        Console.WriteLine(DecodeGuid(encodedGuid));

​

    }

    static string EncodeGuid(Guid guid)

{

    Span<byte> bytes = stackalloc byte[16];

    guid.TryWriteBytes(bytes);

    return WebEncoders.Base64UrlEncode(bytes);

}

​

static Guid DecodeGuid(string guid)

{

    return new Guid(WebEncoders.Base64UrlDecode(guid));

}

}