Developing a network application with C# And SQL SERVER 2005

Question

Hello every bdy dre.........

I have developed the desktop (windows form) application using C# , with MS SQL 2005 database. That is separate application run in four different centers with their own separate database, but now i want to make it centralized database. For all four center has only one data base.
they enter data in one data base and access the data from one place as with central data base.

My problem is that I am stukked now as i dont have any idea to wht to do
either to develop a new application for this purpose that can have centralize data base (asp,web pages,on network)
have I written any application that will run on a network.
to make some changes in existing application so that it work on centralized database(some little changes in app.confif)
to make a new database
to modify the existing database


Please I need your help on how to achieve this. Any contribution would be highly appreciated.


Huma Satti