How to manage plugins and plugins update?

I'm trying to find best way to create extensible and autoupdating application.

Scenario:

• many standalone applications on clients machines
• dlls with plugins for those standalone applications are on one internal server for example in one directory

I'd like create applications which will connect to server, ask about plugins, download plugin, use it and if any update or any new plugin appe开发者_Python百科ared, app should download update and replace/add/delete plugin.

I'd like to have something like centralised repository.

What is the best solution for this problem? I'm trying to use MEF to extend my application, but i don't know any tools/patterns for second stage - auto-updates.

You should check the ClickOnce Deployment http://msdn.microsoft.com/en-us/library/t71a733d%28VS.80%29.aspx