cnurse said:

In 4.x the Create Private Assembly link is only visible if the module is built using the dynamic module WSP approach with the code in the app_code folder.

Ok i've created a folder under App_Code : App_Code\CS and i've put  my Controller and info.cs files into.

i've created a folder under DesktopModules with my View...ascx and ascx.cs files

i've modified web.config

   <codeSubDirectories>
            <add directoryName="Reports"/>
            <add directoryName="CS"/>
      </codeSubDirectories>

Did i need to do more?

(I'm beginer, i just try on a simple module to understand how it works)

 Thanks for your help