Updater Application Block, version 2.0 is a reusable and extensible source code-based guidance, to shows how to add self updating capabilities to .NET-based smart client solutions
The Updater Application Block is a .NET Framework component that you can use to detect, download, and apply client application updates deployed in a central location. By using the Updater Application Block, you can keep smart client applications up to date with little or no user intervention. You can also extend the Updater Application Block to use custom classes for downloading files and for performing post-deployment configuration tasks.
Download it here.