Greetings from Syncfusion.
At present we do not have support to print and download the PDF documents from PDF Viewer in the sever side. However, we can load and print the PDF document in the code behind using the PDF Viewer Windows Forms reference. Please find KB link for the same from the below,
Note: Silent Printing will work only locally and not in the production environment.
Also, you can load and download the PDF document in the code behind as a workaround. Please find the online demo link for the same from the below,
Our PDF Viewer control contains both the server side and client-side code. The PDF document is loaded and processed in the server side and sent the processed data in JSON format to the client for rendering and further processing in PDF Viewer. You can load the PDF document in the server side using PDF Viewer and further Print and Download operations are performed in the client. Please find the UG and the Demo link for PDF Viewer from the below,
Please try this and revert us with more details about your requirement if the provided details does not meet your requirement. It will be helpful for us to investigate further and assist you better.