Generating Reports From Data?

In my current role, I support and develop a .net 1.1 website which was developed by my predecessor.

For generating reports/ invoices/ etc, the site uses a find and replace system reading a template rtf file with a stream reader and writing the output using a streamwriter to an rtf file.

I have been asked to generate a new report for the system which has many more tables than the previous reports and is generally more sophisticated.

I have taken a lot of time in trying to develop this report with not much success as the rtf formatting (e.g par for a line break) is to me quite difficult to master causing the document to crash infrequently in word (!) The rtf solution although frustrating is quite a simple format that can be managed in code. But it takes a lot of time to set up the documents...

Is there a .net code library or similar anyone is aware of that can write rtf to generate tables and other simple formatting. I am restricted to using .net 1.1

If I have the time would like to redevelop this system. I have googled for a more sophisticated system and have seen how to use html, etc. in word docs, but I don't really want to run word on the web server. What are the current best practices to generate invoices/ reports etc. from data using .net? Should I stick with this rtf method or is there an easier/quicker/friendlier way! In this regard I'd consider anything - .net 1 to 4

The application is a typical business system so any links to other resources for requirements such as a document generation system, email system, diary management (tasks to do for a specific user )