How to output an excel spreadsheet with images from ASP.net

Answer 1

Take a look at the NPOI library, which is a great library for generating Excel (and other Office type) documents in .Net.

With their library, they have a sample demonstrating how to load images into Excel, which reads from a file. Since you can have your POPChart can save the images as a memory stream, you can easily take their example and modify it to read from the memory stream instead of the file. The rest of the Excel generation process should be easy enough.