从c＃.net Web应用程序生成PDF / Excel报告

We have a system that is used by a few hundred separate customers, at the end of the month the customer likes to generate a report of the activity with his/her clients. These reports are nothing special; they maybe contain a logo, address and a few lines of mathematical data. Currently we use Crystal Reports but that is just not a pleasant experience ;) also seems like a bit of overkill as we use something like 1% of its functionality.We have a system that is used by a few hundred