for WinForms does not support exporting to PDF. We will consider this as a feature request for one of our future versions.
However, you can consider using the export-to-PDF functionality of our Reporting Tool, which will allow you to present your data in a report, view the report in a WinForms or Web application, and export it to PDF. For more information, please visit: www.telerik.com/reporting
If you have further questions, do not hesitate to contact me.
the Telerik team