I am writing a C#/ASP.NET application:
I want to allow a user to edit an html message and insert images. Pretty simple, right? I want to allow the user to upload the image to a directory that I specify via the C# program. I assume that I need to allow the user to upload the image to a "relative" link?

 

By the time they save the html, I want the link for the image to point to the absolute url for the website.

 

How can I do this?