RadPdfViewer is available as of R1 2020 SP1 and it is a server-side WebForms wrapper over the PDFViewer for Kendo UI for jQuery widget.
It operates on the client, displays PDF files in the browser and consists of a toolbar and a scrollable container that wraps the page elements. The default tools collection includes the pager, open and download tools. The PDFViewer provides full control over the rendering of its tools toolbar items and tools.
Renders and operates on the client-side
Fully responsive design
Built-in accessibility, WAI-ARIA, keyboard and RTL support
Customizable Toolbar and Tools
Integration with PDF.js Processing library
Built-in paging, zooming and seraching mechanism
Virtualization - allows you to perform fast scrolling through the pages
Ability to load files from the client's PC
Built-in file download functionality