The Fingerprint Sensor you are using supports a Microsoft Developed Windows Biometric Framework that can enable you to use this device to create Client Applications to save and process data feed from the device.
You can read more about the framework at the following links
http://msdn.microsoft.com/en-us/library/windows/hardware/gg463081.aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/gg463089.aspx
The API for the framework that you can use in your .NET Attendance Application is here
http://msdn.microsoft.com/en-us/library/windows/desktop/dd401509(v=vs.85).aspx