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this tutorial shows how to add watermarks to multi-page PDF in asp.net 2019 you need download asp.net image converter SDK component from HTTP colon slash slash WWDC om saath kaam slash product slash image - converter after you installed asp.net image converter SDK component create asp.net web application new project you you make sure selected web forms you select references right-click the mouse select add reference click browse select image converter wrapper DLL and PDF converter wrapper DLL PDF wrapper DLL you add folder named uploads you at multi-page PDF file you may select any PDF file you add output folder at overlay image folder you select watermarks PNG image you may select any image you you add new web form name to default.aspx you you add the following import statements to the top of the page add web method named convert I you call a team age method it will add watermarks to PDF you set the left top position of watermark in page load event call convert time method it will pas