using System; using System.Security.Cryptography.X509Certificates; using System.SmartCard; namespace SmartCardExample { class Program { static void Main(string[] args) { try { SmartCardReader reader = new SmartCardReader(); if (reader.IsCardPresent) { Console.WriteLine("Smart Card Detected!"); reader.Connect(); byte[] response = reader.SendCommand( new byte[] { 0x00, 0xA4, 0x04, 0x00 } ); Console.WriteLine("Response: " + BitConverter.ToString(response)); } else { Console.WriteLine("No Smart Card Found."); } } catch (Exception ex) { Console.WriteLine("Error: " + ex.Message); } } } }