I made a website, with some classes , files and bla bla.
I do’t want to upload the code as it is on the webserver, rather i just want to make DLLs out of these files and classes so no one could get hold of my code.

any idea

build your “Business Objects” in VB.NET. Build these as an application. They will push out your .DLL’s

VS can do this for you, there is a command line app in the .net framework folder in the windows folder or alternatively there are free apps that will give you a GUI for the command line function.