最近做的一個案子要讀取健保卡的公開資料，可以讀取身分證字號、姓名、生日等資訊，發現非常好用，可以應用在一些需要大量填寫個人資料的地方，例如申請會員等，可改用讀取ＩＣ卡，就不需要填一堆資料，又因為健保ＩＣ卡的安全機制，所以不會有醫療資料外洩的疑慮。查了很多資料，以下是比較重要的部分指令：
首先將可能會用到的WinScard指令先Import進來:
[DllImport("WinScard.dll")]
public static extern int SCardEstablishContext(uint dwScope, int nNotUsed1,
int nNotUsed2, ref int phContext);
[DllImport("WinScard.dll")]
public static extern int SCardReleaseContext(int phContext);
[DllImport("WinScard.dll")]
public static extern int SCardConnect(int hContext, string cReaderName,
uint dwShareMode, uint dwPrefProtocol, ref int phCard, ref int ActiveProtocol);
[DllImport("WinScard.dll")]
public static extern int SCardDisconnect(int hCard, int Disposition);
[DllImport("WinScard.dll")]
public static extern int SCardListReaderGroups(int hContext, ref string cGroups, ref int nStringSize);
[DllImport("WinScard.dll")]
public static extern int SCardListReaders(int hContext, string cGroups,
ref string cReaderLists, ref int nReaderCount);
[DllImport("WinScard.dll")]
public static extern int SCardFreeMemory(int hContext, string cResourceToFree);
[DllImport("WinScard.dll")]
public static extern int SCardGetAttrib(int hContext, uint dwAttrId,
ref byte[] bytRecvAttr, ref int nRecLen);
[DllImport("WinScard.dll")]
public static extern int SCardTransmit(int hCard, ref SCARD_IO_REQUEST pioSendPci, byte[] pbSendBuffer, int cbSendLength, ref SCARD_IO_REQUEST pioRecvPci, ref byte[] pbRecvBuffer, ref int pcbRecvLength);
[DllImport("WinScard.dll")]
public static extern int SCardTransmit(int hCard, ref SCARD_IO_REQUEST pioSendPci, byte[] pbSendBuffer, int cbSendLength, ref SCARD_IO_REQUEST pioRecvPci, ref byte pbRecvBuffer, ref int pcbRecvLength);
依序下指令：
SCardEstablishContext：建立環境。
SCardListReaders：讀取本機的讀卡機。
SCardConnect：讀卡機連線。
SCardTransmit：下指令給讀卡機並讀取讀卡機的回覆值。