Performance issue- measuring network utilisation by one specific .Net application

Question

Hi,

We have moved our new asp.net application to production some time back on the client side.

My client has a dedicted 8 mbps internet link for their whole corporate.

Now client is complaining about slowness of their corporate internet due to our application.

Now we have to give data to client about how much internet bandwidth is used by our specific application.

Can we monitor our application specific network utilisation by some custom or Windows server utility.Earlier i used to use perfmon performance counter(bytes in/out) to monitor this but that was for whole server and not for a specific application.

Please share your experience on this as this seems to be a common problem

Cheers

TicArch