I had make one windows application and i want to share that application with multiple computer using same database and same application in c# windows application

USe SQL Server or MySql as your database: they are both designed for multiple user access, and all you then need to do is provide a connections string which lets leach client access the same database. (Store this in a config file, so you can change it, and you can also have a separate one for development so you don't mess up production data by accident while testing).
Then all you have to do is deploy your app to each computer, and it should all work.