mojoPortal is a web applicaiton project not a web site project. As such all of the C# source code gets compiled into dlls in the bin folder and we don't deploy the source code to production. There is still some compiling done by the ASP.NET compiler because the .aspx files and .ascx files are like partial classes, but the rest of the code is/must be pre-compiled by visual studio before deployment.
See the article Packaging and Deployment
Hope that helps,
Joe