I'm building an application that has realtime charting and allows a user
to interact with displayed chart (drag and drop, zoom, select items in
chart, add anotations to chart etc).

I haven't seen a .Net application that is this "rich client" - is it
possible to do have this level of "rich clientness" in an ASP.Net
application?

If yes :

I am currently using an ATL COM class to provide the charting
functionality. I have read that Active X objects can be used with C# -
do I have to make any modifications before i use my chart object in C#
code ?