check for updates functionality

How do you implement a "check for updates" functionality in a windows application? I guess you check a file on a webserver containing a version number, compare that to the running version of the app, let the user know the result and provide download link.

Does someone have complete sample code?
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Also see some autoupdater components
Éric MoreauSenior .Net ConsultantCommented:

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netsltAuthor Commented:
I see these solutions work for dll and exe, would it also work to update just some binary database files (.dat files) that are part of the application, or would I need another solution for this?

Like this I could just update the .dat files (that change monthly) instead of updating the complete application.
Éric MoreauSenior .Net ConsultantCommented:
I have created my own application (inspired from the link I gave you) that copies all the files (and subfolders) of a source folder. Your imagination is the limit!
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