Problem with SQL 2008R2 and SQL 2012

Hello,

We have writting C# programma in framework 3.5(2008R2) and converted it to 4.0(2012).

Now we have a problem using the Analysis and Intergation references.

We build a SSIS package from code but it doesn't work on the SQL 2012 server.

Can somebody help us with possible differnces between the references and mostly concerning Microsoft.SqlServer.DTSPipelineWrap/Microsoft.SqlServer.DTSRuntimeWrap?

*Edite*

We found problem lokation in this piece of the code:

        IDTSComponentMetaData100 componentSource = dataFlowTask.ComponentMetaDataCollection.New();
        componentSource.Name = "FlatFileSource";
        componentSource.ComponentClassID = "DTSAdapter.FlatFileSource.2";
        componentSource.LocaleID = 1033;


        // Get source design-time instance, and initialise component
        CManagedComponentWrapper instanceSource = componentSource.Instantiate();
        instanceSource.ProvideComponentProperties();

Thx

Matthias