Running SSIS from C# and framework 4.5 - Not Resolved

Dear All,

I'm working with Visual Studio 2012 + SQL Server 2012 on a development machine and I'm trying to run trough SSIS ManagedDTS library a few packages in order to test them.

I've found the hugly problem of "Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

Following the article here below I modified my app.config in order to have

"<startupuseLegacyV2RuntimeActivationPolicy="true">"

http://social.msdn.microsoft.com/Forums/en-US/03bae0fc-b51c-4258-a80a-8426e855576b/mixed-mode-assembly-and-uselegacyv2runtimeactivationpolicy?forum=sqlintegrationservices

I'm working with framework 4.5 but I also tried with 4.0, the problem still remains. Can anyone help me to figure out the solution for this issue? It sound strange for me that running SSIS with the producer API doesn't work.

BR

Roberto