generate snapshot based on event

Hi,
I have to design couple of snapshot reports. These reports are not supposed to run on a schedule. They must run based on a event. That is when the .net application runs a process and populates a table. Again the report snapshot needs to be generated only if there is data corresponding to that report.
How do I implement this? can any one share your experience.
Thanks,
Gopal

Hi Dinesh,
I am aware of data driven sbscriptions.
Is there a way to generate a snapshot based on a event and that too if there is data to report.
Is Crystal Enterprise is a better solution for this type of reporting needs?
Thanks,
Gopal