using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var guid = Guid.NewGuid();

        var output = Convert.ToBase64String(guid.ToByteArray());

        var s = Microsoft.AspNetCore.WebUtilities.WebEncoders.Base64UrlEncode(guid.ToByteArray());

        Console.WriteLine("GUID -------------------------------");

        Console.WriteLine($"GUID      : {guid}");

        Console.WriteLine($"Base64    : {output}");

        Console.WriteLine($"Base64-Url: {s}");

        using (SHA256 mySHA256 = SHA256.Create())

        {

            byte[] hashValue = mySHA256.ComputeHash(Encoding.ASCII.GetBytes("1"));

            var o1 = Convert.ToBase64String(hashValue);

            var s1 = Microsoft.AspNetCore.WebUtilities.WebEncoders.Base64UrlEncode(hashValue);

            Console.WriteLine("SHA256 -----------------------------");

            Console.WriteLine($"Base64    : {o1}");

            Console.WriteLine($"Base64-Url: {s1}");

        }

    }

}