using Microsoft.IdentityModel.Tokens;

using System;

using System.Collections.Generic;

using System.IdentityModel.Tokens.Jwt;

using System.Linq;

using System.Security.Claims;

using System.Text;

​

class MainClass

{

    public static void Main(string[] args)

    {

        try

        {

            var token = "asdasdasd" as string;

            var tokenHandler = new JwtSecurityTokenHandler();

            var securityToken = tokenHandler.ReadToken(token) as JwtSecurityToken;

            if (securityToken is null)

            {

                Console.WriteLine("PSz was right!");

            }

        }

        catch (Exception e)

        {

            if (e.GetType() == typeof(ArgumentException))

            {

                Console.WriteLine("I was right!");

            }

        }

    }

}