Multiple responses to browser client

Question

Hi,

I am in the process of writing an ASP.Net webforms app, and would like some guidance on how to proceed.

The app will initiate a process that generates an image response, but it will take some time for the image to be produced. Therefore, I would like to return an immediate message to the browser client telling them that the function has been initiated, and then respond again with a completed web page after the image generation process has been completed. The process may take anywhere from 10 seconds to several minutes depending on how many simultaneous requests are made.

How can this be implemented? Can I save the Reponse object in a List object and then use it to return the completed web page?

Thanks