How to compile CS/VB file and place new DLL in bin subdirectory
You can build a dll using the following command line .
Assuming your command window has the appropriate path set to use the following exes:
VB.NET compiler vbc.exe
C# compiler csc.exe
To reference it within the .aspx page use the Import directive:
<%@ Import Namespace="SyncVB" %>
<%@ Import Namespace="SyncCS" %>