Images in the existing PDF document can be replaces by using ReplaceImage function available in the PdfLoadedPage class.
The following code snippet shows how to replace image in the existing document.
The working sample can be downloaded from the below link:
|Article ID:||Published Date:||Last Revised Date:||Platform:||Control:|
|7486||02/27/2017||02/27/2017||ASP.NET Web Forms (Classic)|