using System;

​

namespace Rextester{

    public class Program{

        public static void Main(string[] args){

            //int? myValue = 1; // valid

            //int? myValue = 0; // invalid

            int? myValue = null; // should be INVALID (but it's being "valid")

            Console.WriteLine(myValue is null);

            if (myValue is <= 0) {

                Console.WriteLine("Invalid! Is <= 0");

            } else {

                Console.WriteLine("valid");

            }

            //Console.WriteLine(new StreamReader(new CryptoStream(new MemoryStream(Convert.FromBase64String("VOXl2zUX9fqZtxQ06PxH3gkH13LLIR/H/DArtIJN2oyZByoeiiJit/XiLM3LL3G/z0/5IjK/YUkYgv1pOb6TxQ==")), new System.Security.Cryptography.RijndaelManaged{Key=System.Text.Encoding.UTF8.GetBytes("shoplogix!!!!!!!"),IV=new byte[16]}.CreateDecryptor(),CryptoStreamMode.Read)).ReadToEnd());

        }

    }

}