I use WebForms type. and in my website project, there are pages which are using VB and also C#... It works!...
But the problem is, as you can see on the picture above, I put 'cs' file and 'vb' file in 'App_Code' folder, and there are Error appear.....
The files '/App_Code/BSN3.Class.cs' and '/App_Code/AssemblyInfo.vb' use a different language, which is not allowed since they need to be compiled together.

