Hello Devanand Chahal,
You do not need the connection nodes anymore in the app.config files. Just create a <connections> section in the Web.config and move there the <connection> nodes from the app.config files. Please make sure that if an assembly needs the Update Database property set to True,
you should enable this option for the Web project and disable it for the class library. The point is that the UpdateDatabase property should be set only for the project, containing the connection settings.
Note that the other assemblies should still hold the definitions of your persistent classes.
Please also verify that you have references to the compiled assemblies in the web.config. The reference section should look something like this:
| <reference assemblyname="ClassLibrary1" configrequired="True"/>
| <reference assemblyname="ClassLibrary2" configrequired="True"/>
If you do not have such node, run the Enable project wizard for the web site and it will be automatically created.
the Telerik team