How to read and write smart card using winscard.dll

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C#

.NET

Hi all,
I have smart card reader device.
I have written code for detecting smart card using winscard.dll,it is working fine.
But i don't know how to read and write the smart card.
Is there any function in winscard.dll for reading and writing card??
i got some information that

public static extern int SCardTransmit(
            IntPtr hCard,
            ref SCARD_IO_REQUEST pioSendRequest,
            byte[] SendBuff,
            int SendBuffLen,
            ref SCARD_IO_REQUEST pioRecvRequest,
            IntPtr RecvBuff,    // Copy with marshal.copy to a managed array after call.
            ref int RecvBuffLen);

this function helps to write in card.
but i don't know how to use it
I am new to this..
Please share some information if anybody have.
Thank u in advance..:)
god bless u all..:)