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    <p>First you need a file on your application home web site with the latest version. The best way I think to have special SQL table for this task and populate it automatically after publishing new version / nightly build completion. Your application creates new thread which requests built-in http link with version and compares in with current. In .NET use can use code like this:</p> <pre><code>Version GetLatestVersion() { HttpWebRequestrequest = (HttpWebRequest)WebRequest.Create(new Uri(new Uri(http://example.net), "version.txt)); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if (request.HaveResponse) { StreamReader stream = new StreamReader(response.GetResponseStream(), Encoding.Default); return new Version(stream.ReadLine()); } else { return null; } } Version latest = GetLatestVersion(); Version current = new Version(Application.ProductVersion); if (current &lt; latest) { // you need an update } else { // you are up-to-date } </code></pre> <p>In this example, version.php in only one plain string like 1.0.1.0.</p> <p>Another tip I can give - how to download an update. I like very much next idea: in the resources of your application there is a string of CLR-code which you compile on-the-fly (using CodeDom) to a temporary folder, main application calls it and goes to close. Updater reads arguments, settings or registry and downloads new modules. And calls main application which deletes all temporary files. Done!</p> <p>(But everything here is about .NET)</p>
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