@hamzeh83
Hi Hamzeh,
You should contact the manufacturer of the card reader for information on how to use their reader.
Normally, from what I understand of these things, when a card is presented to a reader, the reader will determine whether or not to deny or permit the person presenting the cards. This is considered to be a "transaction". This transaction should be stored somewhere, like in a database, in the reader itself, or in the access control unit that the reader is connected to.
Your application will need to be able to tell when this transaction happens and will need to be able to retrieve the transaction information. So, your application will somehow have to communicate with the reader, database, or access control unit when the transaction occurs.
The only way to know how to do this is to contact the company that makes the reader and ask them for a software developer kit and any documentation about how their product works.
The experts here will answer any questions you have with concerns to any .NET related questions or problems; however they cannot help you with understand how to retrieve the data from a card reader.
-Frinny