Offline Library Database 2

We are a dutch company which develops RFid-based library solutions for public libraries. One of our solutions is a selfservice desk, which is equipped with an RFid reader and our selfservice software. This selfservice desk enables library customers to checkout and checkin library books. The selfservice software controls different hardware (printer,screen,etc.) and establishes a connection with the library management system. The library management system is a database system which stores all the items, customers, checkouts, checkins, etc. of the library. When the connection to the library management system is lost, e.g. by network failure, all the checkin and checkout transactions at our selfservice desk should be conducted in an offline mode. This means that all the information for a transaction should be stored locally in a file. We are looking for a .Net C# developer who can program the offline database module, according to our C# .Net Interface.