ClickOnce deployment enables you to deploy self-updating Windows and console applications that can be installed, updated, and run from a Web site. For more information, see ClickOnce Security and Deployment.
Starting in Visual Studio 2010, you can target .NET Framework 4 or multiple versions of the .NET Framework in your ClickOnce deployment. You can also troubleshoot installation issues by using enhanced logging and you can create a custom installer.
For Office solution developers, there are additional ClickOnce enhancements, such as deploying multiple Office solutions in a single ClickOnce installer and performing additional actions after the ClickOnce installer is finished. For more information, see What's New in Office Development.
For WPF XAML browser applications (XBAPs), you can request elevation of privileges with ClickOnce. For more information, see WPF XAML Browser Applications Overview.
Support for .NET Framework 4
Support for Multiple Versions of the .NET Framework
Enhanced Logging
You can help troubleshoot problems during ClickOnce installation by using the enhanced logging feature in Visual Studio 2010. The enhanced logging feature stores information such as the parameters passed to the ClickOnce runtime, the browser settings, and ClickOnce security options. For more information, How to: Specify Verbose Log Files for ClickOnce Deployments.
Custom Installer and User Interface