How to synchronize data between multi client application

I need to synchronize the data that "one client" updated and need to be refreshed on "other client" (on another room) of the same application.

1 - Which is the best approach to doing this? I was thinking on SqlDependency but the application can also run on other database engines (I dismiss it) I also think of a timer polling for updates, but I really don´t want to check for a change periodically.

Does anybody has this problem? How did you solve it?.

2 - Additionally. When the data must be updated开发者_开发百科 in the UI without obstruct the work ofo the people in the other pc?

Scenario: 3 PC working with the same data. Creating / updating records that need to be synchronized (to get the last changes that every PC made).

I hope I was clear about my situation.

Thank in advance.

If you know that you are only gonna have 2 instances of the application, then you could do it with WCF. Each of the clients acts as a server for the other one when they want to send an update.

How you want to handle updates to data being edited by both clients... that can be tricky. It depends on your type of data, if the GUI is developed to handle updates and such things.