Simple question - is DNN 6 and 7 compiled with .NET 3.5?

Thanks for the reply Chris,

When you say at least .net 3.5 it for DNN 6 - have you ever tried a RadScheduler in a module using .net 4?

All along I was building my modules in .net 4 with no issues.  We have built quite a few which includes controls like RadFileExplorer, RadGrid, and numerous others.  We have always ran IIS in .net 4 also.  We did not recomplile DNN or anything either.  All fine until I met the RadScheduler.  It ended up being that if I compiled the DNN module for .Net 3.5 and setup IIS for .net 2(which I believe .net 3.5 is just an extension of .Net 2? - not 100% on this) we have no issues at all. 

It(RadSceduler) would not work - meaning the advanced form would freeze, not let me save cancel or close.  Until I moved the server to .net 2 and re-compiled module to .net 3.5.  That is why I am asking.  I also do not believe that the RadScheduler works in DNN 7.  I added a bug to your Gemini list.

This was strange problem that had me tied up for over a week.

Keep in mind that my project worked great in standard asp.net page's.