public class CardBase
    {
        int retCode, Protocol, hContext, hCard, Readercount;
        string cardName = null;
        public byte[] ReaderListBuff = new byte[262];
        byte[] ReaderGroupBuff;
        bool diFlag;
        ModWinsCard.SCARD_IO_REQUEST ioRequest;
        int sendLen, RecvLen;
        byte[] RecvBuff = new byte[262];
        byte[] SendBuff = new byte[262];

        //Establish context
        public void EstablishContext()
        {
            retCode = ModWinsCard.SCardEstablishContext(ModWinsCard.SCARD_SCOPE_USER, 0, 0, ref hContext);

            if (retCode == ModWinsCard.SCARD_S_SUCCESS)
                Console.WriteLine("SCardEstablishContext...OK");
            else
                Console.WriteLine(retCode + " Error establish context");
        }

        //Get available cardreaders
        public string ListReaders()
        {
            ModWinsCard.SCardListReaders(hContext, ReaderGroupBuff, ReaderListBuff, ref Readercount);
            Console.WriteLine("Readercount:" + Readercount);

            //Byte array met ASCII waardes omvormen naar een string, ook nog lege characters trimmen
            cardName = System.Text.Encoding.ASCII.GetString(ReaderListBuff).TrimEnd(new char[] { (char)0 });
            return cardName;
        }

        //Connect
        public void Connect()
        {
            Console.WriteLine(ModWinsCard.IOCTL_SMARTCARD_GET_READER_INFO);
            retCode = ModWinsCard.SCardConnect(hContext, cardName, ModWinsCard.SCARD_SHARE_SHARED, ModWinsCard.SCARD_PROTOCOL_T0, ref hCard, ref Protocol);

            if (retCode == ModWinsCard.SCARD_S_SUCCESS)
                Console.WriteLine("Connecting...OK");
            else
                Console.WriteLine(retCode + " Error connection");
        }

        public void Transmit()
        {
            SendBuff[0] = 0xFF;//start
            SendBuff[1] = 0xA4;//instruction card type
            SendBuff[2] = 0x0; //memory adres
            SendBuff[3] = 0x0;
            SendBuff[4] = 0x01;
            SendBuff[5] = 0x1;//I2c
            sendLen = 6;

            int receivBufLength = RecvBuff.Length;

            ioRequest.dwProtocol = Protocol;
            ioRequest.cbPciLength = 8;

            retCode = ModWinsCard.SCardTransmit(hCard, ref ioRequest, ref SendBuff[0], sendLen, ref ioRequest, ref RecvBuff[0], ref receivBufLength);

            if (retCode == ModWinsCard.SCARD_S_SUCCESS)
                Console.WriteLine("Trasmitting...OK");
            else
                Console.WriteLine(retCode + " Error transmit");
        }

        //End connections
        private void Disconnect()
        {
            retCode = ModWinsCard.SCardDisconnect(hCard, ModWinsCard.SCARD_UNPOWER_CARD);
        }
        private void EndEstablishedContext()
        {
            retCode = ModWinsCard.SCardReleaseContext(hContext);
        }
    }