How to Publish Only App_Code in Asp.net

I have a website (not web application) in Visual Studio 2008, Most of my changes belongs to App_Code. Whenever I change it I need to Publish entire solution and resend nre published verion to my customers.

Publish took about 3 hours from me so that I want to publish only App_Code folder.

How to Do this? Ithink it should be something like

MSBuild App_Code // I know th开发者_如何学Pythonis is not valid I mentiond as a way that I think may work with change

Update : will it work if I remove everything else and then publish the website, after that replace published files to previouse versions?

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Try to publish like this.

C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe -v / -p "C:\WebSite1\App_Code" -u "C:\TargetPath"