I'm not sure what you mean by <<link the TTX file in design time at run-time>> Are you using the RDC? I have no experience with that integration object. All I know is that you can use a TTX file in the CR report designer to develop a report layout, but you must then assign a real data source, e.g. from a VB or Web App, to run the report. That's when and how you use the SetDataSource method. I repeat, a ttx file is NOT a data source, persistent or otherwise. It is a way to design a report without using a data source.