Auto updating my winforms application

Implementing auto updates needs some work.

You will have to maintain a server and a database. The server should run a Web Service (or some kind of communication, remote) that will be called by the application OR application needs to listen to the server (this is not recommended but doable).
You need to implement in application when application starts, it will check if server has a new version (based on data on the server and compare with current application version on client machine). If yes, download and install it.

P.S. - Please post all of your questions in proper forum categories.