I have a project which I have no idea on how to start but would love to do it myself. the system I am to develop is to help monitor the amount of data consumed by internet users of a camous network with the limit of 50mb per day. the system should provide a log-in screen so whenever a user opens the browser, would be required to login and shouldnt be able to open pages unless you have logged in and after the user reaches the 50mb limit, would no longer be able to access the net. I programme using .net so any help would be highly appreciated. thanks in anticipation.

Is this your university project?

If so I'd suggest you look up Cacti it's an open source project that maybe useful to you.  I'm not a programmer but I use Cacti for my Corporate  customers here in the UK and it's a great tool for bandwidth graphing.

http://www.cacti.net/

I don't know how you can implement it for the project at hand but I'm sure it will be a useful resource to start with.

Good luck.

Here's a related project http://oss.oetiker.ch/rrdtool/ follow the tutorial you might learn from it.

thanks. I'l chk them out