return codebehind for published aspx pages

Jalali,

Default publishing won't take .CS files. The corresponding dlls would be published along wiht content files including .aspx. But if you need .CS after publish, need to select some optional check box which will dump all files which is not recommanding. Becasue production environment should not keep such files. Ask the developer to share the development version to you so that you can see the code. Alternatively use any rreflection tools to fetch the code from assembly like .NET reflector.