Hi phrankus,
Firstly welcome to Bytes. If you haven't already done so, please read and become familiar with the
Forum Guidelines.
Are you familiar with SQL and UPDATE statements? If not then I suggest checking out MSDN and Googling/Binging for database connection and data update examples - or even better, look at using a data access layer (DAL) generation tool like SubSonic, NHibernate or ActiveRecord.
In my opinion, if you have designed this from scratch, it sounds like you need to establish a solid architecture for your application from the database layer up - your application will rely heavily on data of one kind or another and you need to design your application's behaviour to reflect that
before even thinking about designing front-ends.
Hope this helps.
codegecko