>My application use data from PostgreSQL database using npgsql.
>
>I need to distribute GUI report designer with my C# application so end users can customize reports.
>
>Any idea, which report designer should I use ?

I use and like ActiveReports. I haven't used the embeddable designer functionality but I believe it's teh same as the full designer...

DevExpress also has a report engine that's been getting good reviews.

+++ Rick ---